Alarms and security related schematics
- Proximity alarm
- Electronic lock
- Electronic door codelock (PIC16F84)
- Ultrasonic remote control & alarm system
- Wire loop alarm
- Door knob alarm (PDF)
- Water seepage alarm (PDF)
- Micro-power over temperature alarm (PDF)
- Personal silent alarm system
- Active IR motion detector
- Frost alarm
- Ultrasonic radar alarm
- Refrigerator door alarm
- Emergency Light & Alarm
- Electronic combination lock
- Proximity detector for humans / living creatures using eddy current detection
- A Basic RF Transmitter for PIR Sensors
- PIR motion detector
- Simple alarm system
- Home security project
- 5 Zone alarm circuit
- Miniature loop alarm
- Novel Buzzer
- Gate alarm circuit
- Modular Burglar Alarm
- Motorcycle alarm
- Enhanced 5 Digit Alarm Keypad
- Enhanced 4 Digit Alarm Keypad
- RF Alarm
- Single Zone Alarm
- Water Activated Alarm
- Water level alarm
- Perimeter monitor
- Digital combination lock
- Alarm control keypad
- Almost Ultrasonic Motion Sensor
- 2-input alarm
- Touch activated alarm system
- Combination Lock (PIC16F84)
- Low power RFID transponder (PDF)
Audio power amplifier schematics
- Two transistor audio amplifier
- Personal stereo audio amp
- Headphone amplifier
- 1.5W Audio amplifier
- Low-level audio amp
- 10W amplifier
- 80W amplifier
- LM383 12V Amplifier
- 4W amplifier
- 8 watt audio amp
- 20W Amplifier
- 50W Amplifier
- 100W RMS Amplifier
- 2-Channel Power Amplifier
- 25W MOSFET audio amplifier
- 50W audio amplifier using ICL8063
- Amplified ear for surveillance
- 20dB VHF Amplifier
- 30 watt FM linear amplifier
- Linear FM 50 watt amplifier with BLY90
- 60W RF linear amplifier using IRF840
- Push-Pull Class A Amp using type 5687 dual triodes
- Push-Pull Class A 2A3 Stereo Amp
- Single Ended Class A2 SV811-10 Stereo Amp
- Compact 50W Integrated Amplifier with Meier Headphone Section
- Audio amplifier output relay delay
- Spatial Distortion Reduction Headphone Amp
- HeadBanger Headphone Amp
- 2W Amplifier
- TDA2030 8 Watt amplifier
- Headphone monitor amp
- 50W audio power amplifier
- Bi-Directional 2.4 GHz One Watt Amplifier
- Bi-Directional 900Mhz One Watt Amplifier
- 20 Watt GaAaFET Power on 2.3 GHz
- 1 Watt 2.3 GHz RF Amplifier Using a MRF2001
- 2.3 GHz Power Amplifiers
- 2304 and 3456 MHz Power Amplifiers
- High quality exponential VCA
- 16 Watt amplifier
- 8 Watt amplifier
- 20 Watt Class-A Power Amplifier
- El-Cheapo - A Really Simple Power Amplifier
- Single Chip 50 Watt / 8 Ohm Power Amplifier
- Hi-Fi Headphone Amplifier
- 100W Guitar Amplifier
- Death of Zen (DoZ) - A New Class-A Power Amp
- Soft-Start Circuit For Power Amps
- Thermo-Fan To Keep Your Amp Cool
- Audio Amp Output Power Limiter
- 55W (Originally 75W) Power Amplifier
- 300W Subwoofer Power Amplifier
- 20 Watt / Channel Stereo Power Amplifier
- Mini bench amplifier (LM386)
- Small bench amplifier ideal for testing audio stages in circuits
- 12 Watt Valve Guitar Amp
- Five Tube Stereo Amplifier
Audio preamp circuits
- Microphone amplifier
- RIAA phono amplifier
- Low impedance microphone amplifier
- High quality audio preamplifier (OPA2134)
- Masthead preamp
- Preamplifier for microphone or guitar use
- Simple microphone preamplifier
- Tube microphone preamp
- Simple Stereo Electret Microphone Preamplifier
- Simple Stereo Electret Microphone Preamplifier
- Phono Preamp
- Simple microphone preamplifier
- ECM Mic preamp
- Hi Fi preamp
- Balanced microphone preamp
- Electret mic amplifier
- Audio preamplifier
- Vacuum Tube Microphone Preamp
- FET Preamp Cable
- Altec 1564A Preamp Power Supply
- Neumann U67 microphone preamp power supply
- Audio preamp
- Telefunken/Siemens/Maihak/TAB V72 microphone preamp schematic
- Altec 428B Microphone Preamplifier schematic
- API 321 mic preamp schematic
- RCA BA-1A two-stage preamp schematic
- RCA BA-21A preamplifier schematic
- RCA BA-31A preamplifier schematic
Automative, car and motorcycle schematics
- Electronic auto stethoscope
- Turn signal alarm
- Motorcycle turn-signal system
- Cigarette lighter 9V adaptor
- Adaptive Windscreen Wiper Control
- Car OBDII diagnostic interface cable schematic pinout
- Car OBD II J1850 PWM, J1850 VPW, ISO-9141 cables schematic pinout
- Grand Cherokee Off-Highway Lights
- Engine control unit schematics
- Portable CD Player Adapter For Car
- Car battery charger
- Wireless Auto Tachometer
- Headlight reminder
- Breath Alcohol Tester controlling a car ignition system
- Simple car battery charger
- Flashing / pulsing third brake like for cars
- Headlight flasher
- Speed alert - wireless portable unit
- Parking aid senses distance to rear of vehicle
- Automatic headlight brightness switch
- Car battery charger circuit
- Electronic car ignition circuit
- Car battery voltage tester using LM3914
- Synchronized multi-spark module (SMSM) for Electronic Ignition Devices (EID)
- Economy radar detector
- Headlight timer
- Parking sonar
- Fuel injector pulse width monitor
- BMW R Series Motorcycle Regulator Schematic
- 80188XL Engine Tachometer
- Simple Car Preamplifier and Artificial Earth
- Breakdown safety beacon
- FCD (Fuel Cut Defencer)
- Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
- 5301 wideband fuel mixture display
- Wide Band Fuel Mixture Display
- 3rd brake light
- 12V to 9V car coverter
- Car Nicad charger
- Combination lock for car liftgate
Data acquisition (DAQ) and data logging schematics
- Air flow detector
- Air flow detector
- Strain gauge sensor
- Digital Water Wave/Tide/Level Meter (PIC16F876)
- 8 Photo-Detector Circuit Board
- Self made data-logger V2.5 (second edition)
- Magnetometer
- Analog input section based on AD9220
- uModem 4+4/8 channel A/D board
- ADXL202 accelerometer to CV output
- Universal flight controllers / datalogger
- Rain detector
- Home Brew Compass Sensor
- Using 555 Timer as an A/D converter
- ADC0804LCN 8-bit A/D converter
- Web-based thermometer project
- Honey Bee counter (PDF)
- Capacitance type liquid level measurement (PDF)
- Thermostat node schematic
- Digital PC Oscilloscope
- Ultrasonic Range & Imager
- Precision Digital Altimeter
- Remote digital thermometer sends data over AC power line
- 4-channel data telemetry system
- Voltage follower with 1G ohm input resistance
- Digital compass schematic
- Temperature datalogger
- Serial Port A/D-converter
- Centronics port D/A converters and low-pass filter
- LCD Thermometer
- Wireless Liquid Level Sensing for Restaurant Applications
- Accelerometer Schematic
- Pressure Sensor-Based Altimeter Circuit
- Ultrasonic range finder circuit
- 1-wire barometer
- Water-level sensor
- Addressable ADC
- Electronic altimeter using PIC16F877
- Wireless weater station
Filter schematics
- Galaxy Noise Filter
- Low-pass active filter
- Filter Circuit for the Earthworm Seismic Data Acquisition System
- 45 to 90Hz hum filter
- Active 2nd Order Filters
- RC Notch Filter (Twin T)
- 'A' Weighting Filter For Audio Measurements
- Multiple Feedback Bandpass Filter
- CW filters
- Self-tune filter
- SSB AF filter
- CW Filters
- Self-tuning CW filter
- SSB AF filter
- Helical Resonator Notch Filter
- 3KHz low-pass filter plus audio amp (PDF)
- Active bandpass filters
- Bandpass filters
- Butterworth filters
- Narrow band audio bandpass filter
- Chebyshev Bandpass Filter
- Bandpass filters
- Chebyshev / Butterworth filters
- Biquad Active Bandpass Filter Schematic
- "A" Weighting Filter For Audio Measurements
- Multiple Feedback Bandpass Filter
- Digital signal processor (DSP) for radio communications
- 29.85 MHZ bandpass filter schematic
- 29.85 MHZ notch filter schematic
- Variable notch filter with both high and low pass filters
- LC filter design
Games and fun stuff (electronic schematics)
- Visor cradle serial interface
- Electronic coin tosser
- Electronic craps game
- First response monitor
- VCR ping pong game
- Video ping pong game
- MBC5/CPLD for the GameBoy
- GameBoy Camera Parallel Port Interface
- PSX controler to PC MIDI converter
- Dreamcast PC serial adapter
- GameBoy Cart Programmer
- 32 Kb x 8 emulator for the GameBoy
- Project: NES to Atari 2600 controller interface
- Battery Meter for Pinball Machines
- SRX1 (Stephane's Robotic eXperiment 1)
- Pine Racecar Victory Judge
- Interfacing Sony control stick to Empeg
- Electronic Nicad glow plug driver
- Multi-User Jeopardy Game (Fastest Finger First)
- Quiz show indicator
- Dreamcast interface
- Flashing heart
- Phoenix programmer
- Funcard programmer
- Bingo!!! (on your tv)
- Slot car TV cronograph
- Furby reverse-engineered circuit
- Sanyo 20EZ monitor Arcade Game (300k ZIP)
- Burger Time Arcade Game (500k ZIP)
- Dig Dug Arcade Game (800k ZIP)
- Frogger Arcade Game (500k ZIP)
- Galaga Arcade Game (542k ZIP)
- Gyrus Arcade Game (800k ZIP)
- Junior Pacman Arcade Game (400k)
- Ladybug Arcade Game (335k ZIP)
- Mappy Arcade Game (470k ZIP)
- Moon Cresta Arcade Game (300k ZIP)
- Mr.Do Arcade Game (554k ZIP)
- PacLand Arcade Game (316k ZIP)
- Pengo Arcade Game (313k ZIP)
- Q*Bert Arcade Game (600k ZIP)
- Qix Arcade Game (476k ZIP)
- Scramble Arcade Game (600k ZIP)
- Time Pilot'84 Arcade Game (870k ZIP)
- Xevious Arcade Game (450k ZIP)
- Magic Wand Conjuring Trick
- Quiz game circuit
- E.S.P. Conjuring Trick
- Space invaders game using PIC microcontroller
- DIT shutterglasses controller
- Tic-tac-toe game using PIC16F628
- Hangman game
- LED dice with slow down tumbling action
- LED Zeppelin game of skill and patience
- Lotto number selector helps you win a fortune
- Simon Says memory game using a PIC16F84A or PIC16F628 microcontroller
- Spin the device educational project based on PIC12F629 microcontroller
- Tic Tac Toe game based on Microchip PIC16F628 microcontroller
- Game Show Timers
- Archery timer
- Coin tosser
- PIC micro Tetris game
- Magic lamp, IR remote control jammer and other fun circuits (PDF)
- Lego Mindstorms Double Rotation Sensor
Infrared based schematics
- IR detector
- Infrared body heat detector
- Stereo IR audio receiver
- General purpose IR receiver
- Wireless IR headphone transmitter
- Wireless IR headphone receiver
- Infrared Receiver Module Schematics
- Infrared transmitter for locomotives
- Infrared gate for door
- Infrared circuits for remote control
- Serial port controller infrared transmitter (PIC16F628)
- Digibox interface
- IR remote control
- 40KHz light receiver (PDF)
- 40KHz TV-VCR repeater (PDF)
- Micro based PIR to IR remote converter
- IR-related ASCII Schematics V1.00
- Infrared remote transponder
- Build an Infrared night scope
- Decoding IR Remote Controls
- IR detector
- PC IR Remote Control Hardware
- PC IR Remote Control
- An Ambient-Light-Ignoring Infrared Active Motion Detector
- Simple on-off IR photoswitch without use of comparators
- Infrared gate (door entry alarm)
- Infrared switch using any infrared remote control
- Improved infrared receiver for PC with status LED
- Infrared link for 10-BASE-T / 100-BASE-T PC network card
- iRDA transceiver to extend IR port range up to 15 meters
- Infrared level detector for liquid level detection and proximity detection
- IR remote control tester
- Infrared Transmitter and Receiver schematic diagrams
- Pyroelectric Infrared Sensor
- Minimal Infrared transmitter for PC
- Simple IR transmitter circuit
- Simple infra-red detector
- Infra Red Switch
- IR remote control extender
- IR Remote Control Extender Circuit (Mark 2)
- IR Remote Control Extender Circuit (Mark 3)
- IR Link
- IR remote control tester
- 40khz IR Tester
- 555 timer 40khz IR Oscillator
- IR detector / emitter
- Fire-Stick infrared remote control
- Simple infrared remote control
- Infrared / Ultrasonic beacon
- Implementing Infrared Object Detection
- Computerized Infrared Remote
Laser related power supplies and data transmission
- Light beam receiver for laser pistols
- 12V supply for He-Ne laser
- Laser diode transmitter
- Low Cost Scanning Laser Rangefinder (PDF)
- Sniper tag laser beam detector
- Laser high-voltage power supply
- Laser power supply
- Laser transmitter/receiver
- Time of flight imagine (PDF)
- Laser harp
- Laser light output intensity meter
- 20MHz VCSEL 3mW laser test circuit (PDF)
- 10MHz to 20MHz laser light detector (PDF)
- Micro-power 40KHz burst laser diode driver (PDF)
- 40KHz laser burst detector (PDF)
- Modulated laser diode tester (PDF)
- Laser range finder and reflectivity meter for the MARS-96 international space project (PDF)
- Ar/Kr Ion Laser Power Supply
- Laser diode power supply circuits
- RS-232 Laser Transceiver
- RS-232 laser transceiver
- Digital radar speedometer - laser reflexion using discrete logic
- HeNe laser power supply
- OPT201 Laser receiver
- OPT301 Laser receiver
- Laser transmitter schematics
- Rangefinder with Fast Multiple Range Capability
- Diode Laser Power Supplies
- Complete Helium Neon Laser Power Supply Schematics
- Home built 100kW nitrogen laser
- RS-232 Laser Transceiver
- Experimental laser data link
- Laser Target Finder Sensor
- Ar/Kr Ion Laser Power Supply Design
- Micro-Laser range finder
- Simple laser communicator
- Real-time Laser Range Finding Vision System
LED related schematics
- Single and Two Cell White LED Drivers Without Inductors
- Big 7-segment LED display board with SPI interface
- LED Flasher
- LED pulser with audible output
- IR Illuminator
- Flashing Christmas LED display
- ICL7660 LED flasher
- LM3909 replacement using discrete components
- 10, 8 And 6 Step LED Circuits (CD4017)
- Colour Shifting For Bi-Colour LED's
- Current Regulators For Light Emitting Diodes
- Incandescent LED Circuit
- Various LM555 LED Blinker Circuits
- Color fade
- 1.5 Volt LED Flashers
- AC Line Powered LEDs
- Astable Multivibrator
- 9 Second Digital Readout Timer
- 9 Second LED Relay Timer
- 16 Stage Bi-Directional LED Sequencer, other sequencer and flaser circuits
- 10 Stage LED Sequencer
- 28 LED Clock Timer
- Fading Red Eyes
- Two Transistor LED Flasher
- 16 Stage Bi-Directional LED Sequencer
- Expandable 16 Stage LED Sequencer
- LED Photo Sensor Circuit
- LED chaser
- 7 Segment LED Counter
- 7 by 10 LED Moving Sign ( 27C512 EPROM)
- 1.5V LED flasher B (PDF)
- Low current LED flasher (PDF)
- 1.5V LED flasher A (PDF)
- Flashing LED advertising badge (PDF)
- Flashing LED advertising badge (PDF)
- Pulsed LED test circuit (PDF)
- Low battery voltage flasher (PDF)
- Adjustable flashing LED
- Knight rider scanning LED lights
- 3V LED chaser using 4017
- 6V ultra-bright LED chaser using 74HC4017
- Led display digital Voltmeter
- PWM white LED drivers
- Heart of LEDs
- Christmas Star
- Christmas tree
- LED Counter
- PIC16F84 LED chaser
- PIC16F84 LED signboard
- PIC16F84 LED signboard 2
- White LED circuits
- Assorted LED circuits
- 13 Color LED Rainbow
- Seven Component Regulated LED Lamp
- High Efficiency 12V White LED Driver
- LED Mood Light
- LED Audio VU Meter
- Robot Beacon rotating light using PIC12C508
- 5x7 Display
- Various LED flashers
- Kitt car scanning LED sequencer
- Robot beacon light display for mounting on top of a robot
- Sky writer - displays 'in air' messages and features inertia switch
- LM3909 LED flasher
- Animated LED signboard (PIC16C84)
- Picxie 2 - 8x8 Animated LED Signboard
Lighting and ligh controller schematics
- Garden light switch
- DMX lighting and special effects
- 1200 Watt Lamp Dimmer Circuit using Q4015LT combination Diac
- Diode Type Constant Lighting Circuits
- Microcontroller Multichannel Light Dimmer
- Varying Brightness AC Lamp
- 12 Volt Lamp Dimmer
- 120VAC Lamp Chaser Using Solid State Relays
- Flashing Neons (NE-51 / NE-2)
- Sequencing Neons (NE-51 / NE-2)
- Touch Activated Lamp
- TRIAC light dimmer
- 12VDC Fluorescent Lamp Driver
- Strobe light
- Adjustable Strobe Light
- RHINO8 EL Sequencer
- 5W Fluorescent light intensity modulator (PDF)
- 1W Fluorescent lamp night light (PDF)
- 6 Channel Auto Reverse Sequential Disco Running Lights
- Low-voltage light dimmer
- Light chaser
- Digi Pack DMX 512 lighting controller
- DMX PC keyboard interface
- 4-channel dimmer rack
- PIC16F873 light controller
- Digitally Addressable DALI Dimming Ballast (PDF)
- Disco light controller
- Neon desklamp
- Electronic night light
- Neon lamp dimmer
- LED Mood Light
- LX-800 Lighting system
- Xenon Strobe Light
- 12V florescent light inverter
- 3 Xenone flashing circuits found in flash for disposable cameras
- Lamp flasher/dimmer
- Christmas lights tester
Medical and health related schematics
- Heart Rate and EKG Monitor using the MSP430FG439 (PDF)
- Snore alarm electronic device
- Heartbeat transducer
- ECG Amplifier
- EKG/EEG circuit
- Wireless Electrocardiogram Monitor
- Heart Rate Monitor (HRM) Receiver Circuit
- Simple lie detector
- ECG Measurement and Analysis
- Cardiac monitor
- Digital pedometer circuit
- Muscular Bio-Stimulator
- Sleeping aid based on electromagnetic-field radiation
- Salt taster - detects the amount of salt contained in liquid foods
- Electronic Stethoscope
- Optical Heart Rate Monitor
- Model 2030 XRAY monitor instruction manual including schematics (PDF)
- Galvanic Skin Response (GSR) Schematic
- Brain-Wave Machine
- Lie detector
- Simple lie detector
- ECG Heart Monitor
- Portable blood pressure monitor
- Heart rate sensor
- The ESP SIM (Sound Impairment Monitor)
- Stress meter educational project using PIC12F629 microcontroller
- Respiration system
Microcontroller based schematics
- PIC based packet radio encoder (PDF)
- RS485-Version of the SAB80C535-Microcontrollerboard
- PC IR receiver based on PIC16F84
- Record and play fast 1-bit sound on a PIC micro
- AT89C2051/4051scanning 7-segment display and keypad
- AT89C2051/4051 Driving dot LED
- AT89C2051/4051stepper motor interface
- AT89C2051/4051connecting dumb terminal
- Motorola 68K SBC (single board computer)
- 8051 SBC (single board computer)
- Simple RS232C Level Converter using Transistors
- Motorola 68HC11 evaluation board
- C-52 EVB Robot Controller
- Mains clock controller using AT89C2051
- AT89C2051/4051 Easy-Downloader
- AT89C51/52/55 Easy-Downloader
- PIC16F84 programmer
- PIC16F84 miniature real-time controller
- Isolated RS232 for PIC16F84
- PIC16F84 debugging terminal
- MiniLOGGER V1.0
- Analog datalogger based on T89C51RD2
- Atmel 89C Series Flash Microcontroller Programmer
- Atmel 89C2051 prototype board
- AT89C2051 real-time controller
- PIC12C508 Night-light saver
- AT89C2051 Night light saver
- Atmel 8051 Flash Based-Microcontroller Programmer
- AT89C2051 Digital thermometer and clock
- 4-Channel Timer using Atmel 89C4051 and MAX7219 display driver
- PIC16F84 CW decoder (PDF)
- Several Atmel AVR programmer circuits
- 12C508 Smart Lock
- Basic Stamp based altimeter
- Interfacing EEPROM to a Basic Stamp
- Homebrew Basic Stamp project
- Interfacing the MAX186 8 Channel ADC to the BSII
- Interfacing the MAX187 ADC to the BSII to measure voltages
- RF remote control based on Basic Stamp
- 80C31 stepper motor controller
- Build a PIC controlled DDS VFO, 0 to 6 MHz
- PIC controlled DDS VFO, 0 to 6 MHz
- Basic Stamp Lightning Activity Monitor
- Parallel AVR programmer
- PIC16F84 line following robot
- PIC16C505 IR / wireless remote control
- Automatic door opener with PIC12C508
- RS485-like multi-drop bus with half duplex serial protocol
- 50 MHz frequency counter, voltage meter & SWR/PWR indicator
- Programmer PIC16F84,12C50x and EEPROM 24Cxx
- RDS Encoder - digital part
- PIC programmer for serial port
- Fully functional PS/2 mouse based on the PIC16F84
- PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720)
- Serial-based PIC16F84 Programmer For Windows 95/98/NT/2000/ME/XP
- PIXpand
- PIC16F877 to IDE interface
- 90S2313 AVR Robot Board
- POCSAG encoder/decoder
- Rotating Sprocket Wheel Generator (PIC16F84)
- Minimal PIC18 board (PDF)
- Talking PIC - based on SP0256
- Sharp GP2D02 Interface to PIC Microcontroller
- Sharp GP2D05 Interface to PIC Microcontroller Sharp GP2D05 Interface to PIC Microcontroller
- Serial to parallel converter using the AT89C2051
- AT89C2051 serial COMs to LED driver
- PIC16F877 Programmer And Development System
- DS1820 Arbiter V2.00 Schematic
- Microchip PIC ICSP implementation
- 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
- LCD Serial Terminal
- Propellor clock (PIC16F84)
- A Scenix (and PIC) Programmer
- MMC to PIC16F876 circuit diagram
- 8088 maximum mode SBC
- EZ80 single board computer schematic (Z80)
- 8051 Development System Circuit Board
- Long-period watchdog timer
- PIC Web Server Schematic
- Generate video signals in real-time using a PIC16F84
- PIC ICD
- Tachometer Measures Very Low Frequencies (PIC16F872)
- Smart card programmer
- Jupiter card programemr
- Tutorial board for PIC16F84A microcontroller
- PIC Project #1 - RS232 to I2C Interface
- Galvanic decoupling of I2C bus
- Programmer PIC16F84,12C50x and EEPROM 24Cxx
- Dual PIC16C84 prototype board
- Graphic LCD interface
- Interfacing a 4X4 keypad to a BS2 using a 74922 encoder chip
- FSK modem with PIC16C84
- Talking YODA project (PIC16C84)
- PIC16F84/PIC16F87x-In-System-Programmer
- Microcontroller interface for 5KW microwave oven
- Using an I2C Serial EEPROM with a Basic Stamp 2
- PIC16F84 Based Morse Code Reader
- AVR-Based Serial Port IR Receiver
- Interfacing piezo elements to a microcontroller
- Victoria TAFE programmer (based on AT89C2051)
- JDM programmer
- PIC micro programmer
- Speech recognition using HM2007
- PIC microcontroller servo motor interface
- PIC micro multiple servo motor interface
- PIC16F84 countdown timer
- PIC16F873 ultrasonic range meter
- PIC16F873 Digital clock
- PIC16F873 remote display
- PIC16F84 stepper motor controller
- Way small web server
- PICADC - a free, PIC based "intelligent" A/D converter
- PIC-Programmer 2
- Connecting PIC12C508 8 to 93AA46 serial eprom
- KD7LMO Micro Beacon (PIC18F252)
- GPS LCD Display Project
- PIC16F84 LED chaser
- PIC micro LED projects
- PS/2 keyboard keystroke logger based on Atmel 89C2051
- Electronic distance meter based on Motorola 68HC908QY4
- Fan timer based on Motorola 68HC908QT2
- Atmel AVR and 8051 series ISP programmer
- AT89C2051 line-follower robot
- Night light saver (PIC12C508)
- USB and GLCD expansion board for 8051 SBC
- Microcontroller sensor and actuator interfaces
- Giant money counter (PIC16F876)
- PIC12C509 logic gate replacement for nitrogen filler
- PIC demo board
- PIC12C509 Gym Timer
- PIC LCD and Keypad driver
- PIC12C508 Phase Controller for 2kW heater
- PIC16F84 TRIAC / IGBT brightness phase controller
- PIC16F84 pulse monitor with date/time output (ZIP)
- Programmer for the 68HC705C8 MicroController
- 27c801 EPROM Programmer Project
- LCD to PIC16C54 schematic
- 68HC11 based RDS decoder
- Acceleration monitor using ADXL202 and AVR
- 40+ MHz 5-digit frequency counter with an AVR 2313
- Interfacing DRAM to AT90S8515
- Temperature monitor/controller: AVR 2313 / DS1621
- PIC micro to ISA bus interface
- Microchip PIC ICD (in-circuit debugger)
- Tony Nixons Pocket Programmer (PIC)
- PicoWeb V5.1 (AT90S8515) tiny web server
- Atmel 89C2051 In-Circuit Programmer Schematic
- 8051 Development System Circuit Board
- 8051 Development System Circuit Board
- 8051 Development System Circuit Board
- Microprocessor using Xilinx FPGA
- Temperature controlled based on AT89CX051
- I2C LCD interface
- AFSK 1200 Modem based on PIC16C620
- PicCon - Hidden Radio Transmitter Controller
- PIC16F84 tone generator with source code
- PIC16F84 tone generator
- PIC16F84 tone generator (6-Bit)
- AVR Beacon Super Keyer
- AVR Frequency Counter
- AVR Digital Voltmeter
- AVR Signal Generator
- Designing a 4-Channel A/D (ADC) converter with the PIC12C671
- Ser-Key 10-Key Serial Keypad Encoder
- 2-wire LCD interface using PIC16CF84
- PIC16F84 Serial I/O-expander with PicBasic
- Camera remote control system using Basic Stamp
- Low cost Atmel in-system programmer
- Ultra low-cost programmer for AT90S family
- Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypad
- Electronic safety lock based on ATtiny26
- GSM SMS remote control using AVR microcontroller
- 128x64 LCD Driver for AT90S2313 (ZIP file)
- Connecting LED to PIC Micro I/O pins (PDF)
- Microprocessor RS-232 Reset
- Microprocessor RS-232 Reset
- AT90S8515 experimenter board
- Multi-chip programmer for PIC microcontrollers
- Buffered PIC chip interface
- 2-Digit Counter using the PIC12F629 chip
- Multi-chip programmer for Microchip PIC microcontrollers
- Multipurpose buffered PIC microcontroller development system
- ScanMate audio activated recorded
- PIC vacuum fluorescent display interface
- PIC16F876 Datalogger
- Kodak DC-20 camera interface (PIC12C509)
- Kodak DC-20 camera interface (PIC16F84)
- PIC ICD in-circuit debugger circuit diagram
- Wisp628 ISP Microchip PIC Programmer
- WLoader - PIC16F877 application loader / bootloader
- Nixie clock (PIC16F876)
- Zilog Z80 thermostat embedded web server
- Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
- 10 tricks for interfacing to the PIC16C508
- Interfacing the PIC16C508
- LED 5x7 display using a PIC microcontroller
- Analog to digital (ADC) conversion notes
- Multi-chip programmer
Misc audio (also see Music, Amplifiers, Preamp)
- Electronic siren
- Two-tone siren
- Underwater microphone
- Code practice oscillator
- Noise generator
- Electronic whistle
- Twin-T Audio Sine Wave Oscillator
- 1.5V Audio Amplifier
- Low Power Op-Amp - Audio Amp (Intercom)
- 555 Tone Generator (8 Ohm Speaker)
- 3 Transistor Audio Amp (50 milliwatt)
- Low Frequency Sinewave Generator
- Automatic Charger for Battery Operated Hi-Fi Preamps
- Six-channel Mixer and Amplifier
- Audio Signal Source
- Analog VU meter
- Voltage controlled amplifier
- Audio graphic equaliser
- Intercom preamp
- FET audio mixer
- Microphone mixer
- Tone control
- Digital volume control
- Sound level meter
- Very loud beeper (PDF)
- Digital noise generator (PDF)
- Tone display system
- Tube amplifier
- Condenser microphone hookup
- Phase shifter
- Paradoxical Sound Syntheizer
- Digital volume control
- Electronic attenuator
- Speech recorded using ISD2560
- Precision audio millivoltmeter
- Automatic loudness control
- Three channel audio spectrum analyzer
- Base / treble control circuit using LM1036N
- Cuckoo sound generator
- Room noise detector
- Various tube crossover circuits
- Minimum Theremin Kit Schematic
- Bias circuits
- Audio line isolator
- Dynamic microphone to electret microphone input
- Line level signal to microphone input adapter
- Simple two line output combiner
- Electret microphone powering circuits
- Use amplifier phono input as line level input
- Speaker signals to line level inputs
- Spring reverb unit
- Sine wave generator
- Simple amplifier
- 3-Band equalizer
- 6-Input mixer
- Doorphone intercom
- Stereo line driver
- Audio notch filer
- Peak reading audio level meter
- Tone control
- Speaker Microphone Circuit
- Electronic canary
- Electronic siren
- Analog Synth Keyboard Schematic
- Weird Sound Generator
- Microphone phantom power supply
- Voltage Controlled Mixer w/Modulator
- Dual Voltage Controlled Oscillator w/Modulator
- Dual Voltage Controlled Filter w/Modulator
- Stereo Ducker
- MS Stereo Decoder
- MS Stereo Microphone
- RIAA Equalized Stereo Phono Preamp
- Tube active crossover
- Improved PL tone decoder
- Magnetic cartridge amplifier
- LM358 preamp
- Sound detector
- Tone detector
- Tone generator
- Warbler
- Audio Detector Circuit
- Voltage Controlled Panner
- Guitar Reverb Effect Version 2
- Stereo Audio Isolator
- Panner Waveform Generator
- Voltage Controlled Panner
- Low Noise Microphone Preamplifier
- Bridging Adapter For Power Amplifiers
- Simple Surround Sound Decoder
- Simplest Ever Amplifier Bridging
- Stereo Width Controllers
- Power Amplifier Clipping Indicator
- Phono Preamps For All
- Digital Delay Unit For Surround Sound
- Parametric And Sub-Woofer Equaliser
- High Quality Sound Mixer
- Loudspeaker Protection and Muting
- Direct Injection Box for Recording & PA Systems
- Minimalist Discrete Hi-Fi Preamp
- Signal Detecting Auto Power-On Unit
- Load Sensing Automatic Switch
- Amplifier thermal protection
- Active Sub-Woofer and Controller
- Balanced Line Driver & Receiver
- VU And PPM Audio Metering
- Variable Amplifier Impedance
- Linkwitz Cosine Burst Generator
- Low Noise Balanced Microphone Preamp
- Fast Audio Peak Limiter
- Subwoofer Equaliser
- Arc welder sound simulator
- Telephone ring sound simulator using SMT (surface mount technology)
- Stereo LED VU meter using discrete components (BC547 transistors)
- Surround Sound Decoder Mk2
- Audio mixer
Miscellaneous schematics
- Mobile APRS / GPS tracking system
- Electronic fish lure
- Ultrasonic sound receiver
- Experimental data transmitter for fiber optics
- Experimental fiber optic receiver
- Ion detector
- Darkness monitor
- Electroscope
- Simple event counter
- Geiger counter
- Light detector
- Short-circuit beeper
- LM 1800 FM stereo decoder
- Glitch detector
- MAX924 bar-graph level gauge
- Ultrasonic generator
- Negative ion generator
- ELF Monitor
- Laboratory Control System for Cold Atom Experiments
- Chaos generator
- Simple BFO metal detector
- Voltage Comparator Information And Circuits
- Light Activated Detector Circuit (LM393/LM555)
- GoldPic 3 Pulse Induction Metal Detector (has electronic kit available)
- PL tone generator (NE567)
- Full-duplex doorphone with 3 wires connection
- G Strain energy absorber
- RDS Encoder
- RDS Encoder
- FET based metal detector using MPF102 / J310 BF998 FETs
- Ultrasound detector
- Discrete Set/Reset Flip Flop
- Monostable Flip Flops (one shot)
- Discrete Bistable Flip Flop
- Sony RS-422 ADAT sync cable pinout
- Garmin Foretrex 101,201, Forerunner 101,201 to Serial DB9 cable schematic pinout
- Biasing Op-Amps into Class A
- Bleeper box for time reference
- Analog computer
- BayComm packet modem
- Morse monitor
- HamComm modem interface
- Morse paddle keyer
- UV light box
- Hardware Random Bit Generator
- Random noise generator
- Analog pulse counter
- Analog opto-isolator
- Pulse width modulators (PWM)
- Pulse width to voltage converter
- Fantastic Atom Expander
- Black Light
- Computerize Your Room/Home
- Flash slave trigger
- Suddent ionospheric disturbance (SID) receiver
- Magnetic levitation device
- Tesla power receiver
- Lazer Tag Equipment Modifications
- Garmin GPS data interconnect
- Inexpensive APRS Weather Station
- Walking robot
- Basic op-amp circuits
- Ion detector
- 1uS light pulse descriminator plus F to V converter (PDF)
- Broadband 2MHz optical fiber receiver (PDF)
- Modulated light received (PDF)
- 1uS light pulse receiver plus post amp (MISC)
- Broadband 5MHz optical fiber receiver (PDF)
- High-speed light receiver (PDF)
- Basement doorbell beeper (PDF)
- Time to dust indicator (PDF)
- Low-power optical interrupter (PDF)
- Simple nitrogen spark generator (PDF)
- Ultrasonic transducer oscillator circuit
- Build logic gates using discrete parts
- Jacob's Ladder
- Circuit for gold wafer card
- Keys finder
- Electronic Eavesdropping Devices Detector
- Lightning Detector
- Geomagnetic field detector
- Seismic detector interfaces to datalogger
- Miniature magnetic gun (rail gun)
- High voltage stun gun
- Mini efficient magnetic coil launcher from disposable camera flash
- Sudden Ionospheric Disturbance (SID) Receiver
- A selection of robotics projects
- Bat detector (new)
- Vat detector (old)
- Variety of quick designs
- Gold wafer (smartcard) programmer
- Making a FRED photopopper
- GPS receiver support kit
- Griffith Observatory Tesla Coil
- Fogger smoke machine
- Dinsmore 1490 digital compass
- Geiger counter
- Electric field disturbance monitor
- Inexpensive seismometer project
- Digital dial
- How to Make a Roomba Serial Interface
- Doorbell for the Deaf
- Electromagnetic field detector
- Insect Repellant
- High Quality Intercom
- Magnetic Gun.
- Metal detector
- Static Electricity / Negative Ion Detector
- Ultrasonic dog whistle
- 2D3 Nixie clock Schematic
- Popular Electronics Ultrasound Detector
- An Inexpensive X-ray Machine
- Navigator 555A radio direction finder (RDF) circuit diagram
- Magnetic levitation circuit
- u-Blox GPS receiver board
- Assorted digital circuits
- Basic electronic circuits
- Miscellaneous simple circuits
- Digital Call Sign Annunciator
- Monitor output from Motorola Oncore GPS engine in HP Z3801A in GPS Disciplined Oscillator
- Ultrasonic switch
- Sound finding cricket with phase detector
- Sound finding cricket
- Common Ground for Older VPW Circuit
- Very basic circuits
- Bat detector
- FCTS Project
- Count Accumulator for Radiation Levels (CARL)
- Modifications for CDV700 Geiger Counter
- Smooth Tone Clickless CW Sidetone Generator
- Lightning Activated Camera Shutter Trigger
- Big Ear Stereo Parabolic Microphone
- Ultra Low Power LCD Indicator
- 12 Volt Toilet Tank Refiller
- Morse Code Beacon Keyer
- Lightning Activated Camera Shutter Trigger
- Cost Effective Multi-Spectral Scanner for Natural Gas Detection
- Simple metal detector electronic circuit
- Metal detector Mk1 - find hidden treasure at the beach
- Metal detector Mk2 - More sophisticated 5 transistor metal detector (BC547, BC557, BC338)
- Driving N-channel FETs from TTL
- Morse Code Practice Keyer 1
- Morse Code Practice Keyer 2
- 741 Light Sensor
- Fluid level detector
- The Aisin-Seiki GPS-Receiver (The "US$20 GPS")
- Morse code display
- Cloud charge monitor (PDF)
- Intercom schematic
- Simple BFO metal detector using 2N3906 and 2N3904 transistors
- Scaling ADXL50 accelerometer output
Model and remote control schematics
- autopilot: Do it yourself UAV
- Snake throat muscle controller
- Handy cricket for robotic applications
- Traffic light controller with 20-output sequencing
- 556 Timer Stall-Motor Switch Machine Drivers
- 5 Times Around Circuit
- Audible Train Approach Warning Circuit
- Across The Track Infrared Detectors
- Automatic Reversing Circuit - Mk IV
- Rail Crossing Diamond Protection Circuit
- Automatic Railway Grade Crossing Flashers
- Incline Railway Control Circuit
- Model Railroad Odometer Car
- Turnout Anti-Derail Protection Circuits
- Various Transistor Throttles Cicuit Schematics
- Three Terminal Regulator Type Throttle (LM350K)
- Timed Uncoupling Ramp Driver (LM555)
- Grouped DCC Block Occupancy Detectors
- First Across The Line Race Scorer Circuits
- School Bus Signals Circuit
- Timed DC Throttle
- DCC - Zero Stretching Simulator (LM555)
- A Receive Signal Decoder
- 27Mhz toy car receiver
- 27Mhz toy car transmitter
- One ounce rocket ejection timer
- LED traffic lights
- Proportional radio remote control
- Alf: The Robotic Matchbox car
- Seaplane schematic
- Model Rocket with Video Camera
- Signal breaking module
- Animatronic Snake Throat Muscle Controller
- Electronic millipede robot
- Downed model locator
- Precision Receiver Battery Low Voltage Alarm
- Launch controller for multiple rockets
- Discharger for Receiver Battery Packs
- RC Receiver Battery Low Voltage Alarm
- Downed model locator Mark 2
- Robot with PIC16F84 brain & InfraRed eyes
- 0-10V control for RC servos
- Robotic microcontroller board
- Multi Rocket Launcher
- Model rocket launch controller
- Pad launch controller for model rockets
- Simple flashing light circuit
- Simple flashing light circuit
- A dual alternating flashing light circuit
- Simple flashing light circuit
- A dual tandem flashing light circuit powered by a 9 volt battery
- Simulate the Gyralite (dual flashing headlights).
- Simple train detector using ambient light and a photocell
- R/C digital camera controller
- R/C helicopter camera
- Building an RF Remote Control System
- Motor walker circuit
- 250-amp Speed Controller for RC cars
- Level crossing for model railways
- Building a robot arn using Nitino muscle wire
- Signal module for model railways adds a high degree of realism
- Simple throttle control ideal for railway shuting yards or a second main track line
- Spider robot electronic project page
- Two tone train horn
- R/C Emergency locator alarm
- Remote switch for radio-control aircraft accessories
- Angelfire rocket GPS payload
- Radio Control Battery Backup
- Glow Plug driver for model engines
Motor and general control schematics
- Bridge head
- PWM motor controller
- Transistor relay driver
- Latching relay driver
- Relay delay circuit
- Touch switch
- Low voltage DC motor speed controller
- Flashing neon christmas lights
- Three input first response monitor
- Switch-on delay circuit
- Electronic thermostat
- LM3911 temperature controller
- Programmable light-activated relay
- Simple 10 Stage Control Box
- One component stepper motor driver
- Dual Stepping motor drivers using UDN2540
- PWM DC motor control with SG3525
- Stepper Motor Driver using TEA3718/3717
- Microstepping with PBM3960 and TEA3718
- DC Motor Driver with L6203
- Stepper Motor Driver using L298 and L297
- Several stepper motorol control circuits
- Wireless RF PWM dual motor controller
- H Bridge Motor Control Circuits
- HIGH or LOW Power Switch For Lights or Small Motors
- Push Button Motor Control Circuits
- Motor speed controllers
- Electronic Thermostat Relay Circuit
- Interfacing 5 volt CMOS to 12 volt loads
- Light Activated Relay
- CMOS Toggle Flip Flop With Relay(CD4013)
- 555 Timer Monostable Circuit Using Pushbutton
- Dual Channel Servo Pulse to H-Bridge Interface
- Current loop interface
- Switching solenoid driver
- Modular relay system
- Light/dark detector
- Pulse Width Modulation DC Motor Control
- Stepper motor controller
- Touch switch
- Anti-jam system for rotary diecut machine based on PIC16F84
- Bridge control for PLC using PIC18F84
- H-Bridge motor controller (5 amps, 100 watts)
- Dual Channel Servo Pulse to H-Bridge Interface
- Servo pulse to PWM converter
- Rolling code 4-channel UHF remote control
- Pushbutton one-shot and latch (PDF)
- Charge coupled bi-directional power MOSFET relay (PDF)
- Finger touch activated switch (PDF)
- Machine vibration triggers hour meter (PDF)
- Solid state relay (PDF)
- Line-powered Xenon flash transmitter (PDF)
- 9V Xenon photoflash controller (PDF)
- No-Hum Fan Controller
- AC switching with TRIAC from TTL
- Control 120VAC relay with TTL
- Driving a relay with a CPU
- Power-line Appliance Controller
- Solid-state power controller
- High And Low Voltage Cut Off With Time Delay
- Optically isolated stepper motor controller
- Stepper motor controller
- 35KHz Magnetic-Radiation Remote-Control
- Voice activated switch using MC2830
- Combination-controlled, fully customizable RF remote control
- Thermoelectic controller (scriptable thermometer)
- Stepper motor positioner
- Thermostat
- Frequency switch
- PIC16F84 RF remote controller
- H-Bridge shematic
- DS1821 programmable thermostat
- Hot Water Tank Indicator
- Temperature monitor
- Cold activated switch
- Voltage comparator switch
- Dark activated switch
- DC Push Button Motor Control Circuit
- Light detector
- DC Motor Reversing Circuit
- Sound operated switch
- LDR light/dark activated relay switch
- Touch Switches
- 6090 digital decoder schematics
- Assorted relay control circuits
- Adjustable Voltage motor controller
- Serial servo controller
- DC Motor-Driver H-Bridge Circuit
- Constant Temperature Circuit
- PWM Motor Speed Controller / DC Light Dimmer
- Constant Temperature Circuit
- PWM DC Motor Speed Control
- Solenoid starter
- MOSFET based speed controller uses 9 IRFZ40 power MOSFETS
- CO2 controller for planted tanks
- Light activated relay
- Delayed shutter control for Kodak DC-20
- Gasoline generator automatic throttle controller
- MOSFET H-BRIDGE schematic and theory
Music related schematics (also see Audio)
- Audible metronome
- Visual metronome
- Peak-reading meters
- Octave screamer
- Amiga MIDI interface
- Apple Mac to MIDI synthesizer interface cable
- Apple Macintosh MIDI interface schematic (basic version)
- Apple Macintosh MIDI interface schematic (deluxe version)
- Standard MIDI to MIDI interface cable diagram
- Simple MIDI switcher
- MIDI interface / cable tester
- MIDI keyboard
- MIDI merger schematic
- 25-pin PC serial port to MIDI synthesizer interface cable
- 9-pin PC serial port to MIDI synthesizer interface cable
- Serial MIDI interface
- Microcontroller MIDI interface
- MIDI keyboard circuit
- Spring reverb unit
- MP3 Player
- Simple colour organ
- Guitar fuzz effect
- 8 note tune player
- Colour (Sound) Organ
- Transisor organ
- BookPC Car MP3 Player
- Yet Another Mobile MP3 Player
- Wave Multiplier for music synthesizers
- Miniature metronome
- Zonk Machine and Treble Booster
- Simple line mixer
- Simple MIDI tester
- MIDI Controller Footpedal
- DIY Serial MIDI Interface (80C51/80C31 Version)
- Electronic metronome
- Sound Effects Generator
- Sound Effects Generator 2
- Sound Lab Mini-Synth Guitar Trigger
- Digital Guitar Tuner
- Drum tone oscillators
- Analog MIDI synthesizer
- Spring reverb
- MIDI to CV interface
- Dual phantom power pre-amp
- Four channel fuzz box
- Theremin controller
- Vocal zapper
- MP3 Player circuit schematic
- MIDI drum machine project
- MIDI Drum Machine Analog Input Schematic
- Guitar Reverb Pedal
- Guitar Tremolo Unit
- Spring Reverb Unit For Guitar
- Ultra Simple Bass Guitar Compressor
- Vox AC30 Guitar Amplifier Simulator
- Guitar Vibrato Unit
- Musical Instrument (Expandable) Graphic Equaliser
- Simple open source MP3 player with SD/MMC memory card support
- Midibox 64
PC related schematics
- I2C printer port adaptor
- RS232C Level Converter
- PC electrically isolated RS422 interface using SN75176B or MAX485
- PC electrically isolated RS485 interface using MAX487 or SN75176B
- Short circuit protected power supply from PC 12V supply
- Isolated Full Duplex RS232C Interface
- RS232 DB-9 switch to flip between two serial ports
- DB-9 Connector to DB-25 (both RS-232)
- Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
- Modem Rockwell RCV336/ACF model V1433VQR ext.
- Genius Mouse schematics
- Commodore 64 24-bit parallel port interface with 8255
- Sound Card Interface with Tone Keyer
- Ericsson phone to PC serial port interface
- PC serial port receiver
- Parallel port relay interface
- Digital cameras (AGFA, Olympus) to PC (COM) cable pinout
- Mac to HP48 cable pinout
- Serial port temperature datalogger
- Game boy camera PC serial interface
- Jupiter card programmer
- Parallel (Printer) Port Interface
- RS-232 line monitor and loopback cables
- The KD2BD Pacsat Modem
- SWTP PR-40 Printer Interface Schematics
- A Serial Infrared Remote Controller
- PC Serial and Parallel Port Software and Interfaces
- Interfacing 16x2 character :LCD to parallel port
- RS-232 Protocol Analyser
- Interface cable for Casio QV-200 digital camera
- Radio clock for PC's
- 4-channel 8-bit analog-to-digital converter for PC
- Printer port ADC
- Parallel port ADC based on MAX147
- Analog Signal Acquisition for PC Printer Port
- More accurate PC/AT clock
- Getting power from RS-232 interface
- Barcode scanner
- SmartCard PC Emulator
- Relay interface add-on board for PC
- 8-way relay interface board for PC parallel printer port
- Stepper motor controller for PC parallel port
- 3-axis stepper motor controller for PC parallel port
- PC based thermometer based on Dallas DS1621
- Simple PC thermometer for serial port but using R/C network for measurement
- Dallas DS1620 based USB Digital Thermometer
- PC thermometer using PC game (joystick) port
- iRDA interface for motherboard using Vishay TFDS4500
- LCD2LPT with LIRC (LCD to LPT printer port) interface
- FM radio with PC parallel port interface
- Build your own iRDA SIR Transceiver (Dongle) using MCP2120
- PC thermometer
- Dive computer interface
- Parallel port servo controller
- GPS receiver (Gamin, Eagle etc) to PC interface cables
- Connect two CD-ROM drives to one soundcard
- Headphone driving circuit for soundcards
- Get power out of PC parallel port
- Null Printer Adapter
- PC speaker volume control circuit
- How to get power from PC to your circuits
- RS-232 surge protection
- Simple RS-232 serial port buffer circuit
- Get power out of PC RS-232 port
- Sound Blaster Microphone Preamplifier
- Sega 3D glass interfacing circuits
- Convert Atari-style joystick to PC joystick port
- Fake Joystick circuit
- Using the joystick port as general purpose input
- Connect other circuits to PC joystick port
- Schematic of a standard PC joystick
- Simple PC SmartCard reader
- Fax to modem interface
- Analog to Digital Conversion (ADC) and Communicating with a PC
- Temperature sensor for PC
- PC interface for point controller
- PC-based ISA data acquisition and control board
- Linux Infra-red Remote Control (LIRC)
- Homebuilt RS232 LCD Interface
- USB I/O interface board for PC
- Compter microphone
- CCD linear image sensor to PC parallel interface
- Laptop Computer Serial Port Power Booster
- Assorted computer interface circuits
- HamComm Interface
- Apple II/II+/IIe IDE Drive Interface
- Basic Stamp I & PC Relay Controller
- RS-232 to TTL cable
- Hi-Fi PC Speaker System
- How to construct Garmin GPS receiver interface cables
- iRDA printer adapter
- http://www.teaser.fr/~amajorel/jasmin/
- 160 Baud ALDL Hardware Interface
- AT PC Power Supply 1
- AT PC Power Supply 2
- AT PC Power Supply 3
- AT PC Power Supply 4
- AT PC Power Supply 5
- iLINK Interface
- Digital Signals Decoding Interfaces
- 9-pin null modem cable
- RS232 - Lowe HF-225 interface
- RS232 to IrDA convertor using Vishay TOIM3232
- Interfacing PC sound card to SSB rig
- Supply Derives Power From 3-Wire RS-232 Port
- 24-line PC digital interface (PDF)
PDA / music player interfaces and schematics
- Palm Keyboard interface board
- Casio interface circuits
- SHARP palm-top/hand-held to RS232 serial converter
- Fitting a JTAG interface to an iPAQ 3600
- Apple iPod dock pinout
- Casio calculator interface schematic
- Palm Pilot, Palm III, V, VII, VIIx, Handera interface port pinout
- Interfacing ultrasonic range finder to BrainStem
- Hamamatsu UVTron Interface to a BrainStem
- Casio datalogger
- Design and build your own iPod docking station
- Casio datalogger
- Interfacing ADXL202 accelerometer to PalmPilot
- PalmPilot audio interface
- PalmPilot cradle to modem adapter
- PalmPilot connector pinouts
- PalmPilot serial port interface
- PalmPilot memory schematics
- Aladin interface
- PalmPilot turbo boost guage interface
- MIDI interface for PalmPilot
- IBM PC keyboard to PalmPilot interface
- Aladin interface using op-amp
- Wireless local network for PalmPilot (large PDF)
Power supplies and control schematics
- Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
- 13.5KV power supply
- Kirlian device supply
- LM317 adjustable power supply
- LTC1265 Nicad charger
- Single cell lithium battery charger
- Smart battery charger
- Battery charge indicator
- Lead acid trickle charger
- 12B Battery condition indicator
- Alkaline battery charger
- Regulated Power Supply Circuits
- Basic Solid State Relays
- High Side Current Monitors (LM358, Zetex - ZXCT-1009)
- Low Battery Voltage Cutout Circuits
- Alternative power source for Magellan GPS receivers
- Dynamo Current and Voltage Regulator
- Generating Negative 5 Volts from 9 Volt Battery
- LED Battery Condition Indicator
- LM317 Variable Voltage Regulator
- LM317 Regulator With Pass Transistor
- High Current Regulated Power Supply
- Simple Variable Voltage Source
- Various switching power supplies
- Variable 3 - 24 Volt / 3 Amp Power Supply
- 2 watt switching power supply
- Variable Voltage and Current Power Supply
- Low Power DC to DC Converter
- Constant Current Battery Charger
- Intelligent NiMH/NiCd switched mode fast charger
- Nicad battery charger
- Simple power supply
- Voltage converter
- Bench power supply
- Easy power supply
- Valve power supply
- 6V to 12V Converter
- Tesla coil / HV generator
- High Current Power Supply
- Dual Polarity Power Supply
- High Voltage High Current Power Supply
- Transformerless Power Supply
- Fixed Voltage Power Supply
- Voltage Inverter
- Voltage Inverter
- Dual power supply
- Negative voltage generator
- Voltage doubler
- Power reminder beeper (PDF)
- Unplugged power cord alarm
- Machine power loss beepter (PDF)
- Low-dropout 12V regulator (LM324)
- HV supply: 12VDC in, 12KV out
- Generating -5VDC from +5VDC
- Filtering PC bus POWER
- Bidirectionall power inverter
- Nagative voltage generation using 555 timer
- Flyback transformer driver
- Basic UPS Power Supply
- Fuse monitor / alarm
- 500W low cost 12V to 220V inverter
- TTL power supply with crowbar protection
- Pulse Charger for reviving tired Lead Acid batteries
- High current regulated power supply
- CEMF (counterelectromotive force) charger
- Ignition Coil High Voltage Generators
- One 9V battery gives +18, +25, +33V
- +9V *and* -9V from one battery
- Adjustable power supply using LM317
- Simple +5V power supply circuit
- 12 Vdc - 120 Vac Inverter Schematic
- +12V/-12V Power supply unit
- +/-12V to +/-5V Power unit
- +5V Switching regulator (1)
- Switching regulator (2)
- Electric power controller
- +30V power supply with +5V
- +30V DC-DC converter
- DC/AC inverter (2)
- DC/AC inverter (1)
- PIC16F873 DC motor speed controller
- 12V 30A power supply
- Dual regulated power supply
- Fuse blown indicator
- Gyrator circuit
- Variable power supply
- LM317 Regulator Circuit
- Nicad battery charger
- Regulated 12V supply
- Unregulated power supply
- Snowmobile GPS power adapter
- Simple switching power supply
- Assorted power source and control circuits
- 12 volt battery monitor
- 12 volt power supply
- 5 volt power supply
- Battery voltage monitor
- LM3914 battery monitor
- Multiple voltage power supply
- Voltage doubler
- Voltage inverter
- PWM DC Motor Speed Control
- Battery Low Voltage Beeper
- PWM Motor Speed Controller / DC Light Dimmer
- PWM Motor/Light Controller
- Low Power LED Voltmeter
- Temperature Controlled Nicad Charger
- PWM Motor/Light Controller
- PWM Motor/Light Controller variants
- Low Power LED Voltmeter
- Temperature Controlled NICD Charger
- Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
- Simple DC Adapter Power Supply
- Variable Dual Lab Power Supply
- Two amp variable power supply
- Automatic AA nicad battery charger
- Battery charge for 12V SLA batteries
- Turn an ordinary wall wart / plug-pack into a regulated device
- Battery Charger Ideas
- Power control for arc welders and other inductive loads
- Charger for gel lead acid batteries
- Compressor-mate power protection for refrigerators, freezers and air conditioners
- Battery Characterizer
- Nicad Battery Discharger/Capacity Indicator
- 200 Watt Modified PC Power Supply 13.5 Volt 14 Amp
Radio-frequency schematics (also see Transmitters)
- UHF oscillator
- Economoy short-wave radio
- Linearized RF detector
- Two-band radio
- Shortwave conveter for scanners
- FM Bug
- AM Radio
- Toroidal coil RF shortwave receiver
- Crystal radio
- CW RECEIVER 40/80 meter CW receiver
- WLW 500KW Transmitter Schematic
- AM-Receiver for Aircraft communication (118.250MHz)
- AM receiver for aircraft communications
- 45-860MHz Radio receiver based on UV916-tuner
- 80 Meter CW ARDF receiver
- Four channel RF remote control
- Receiver building blocks
- Simple wireless radio data link
- RX3302 receiver module schematic
- Superregenerative 27MHz receiver
- 49MHz walkie-talkie
- Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
- Vibrating pocket bug detector
- Simple Op-Amp Radio
- UHF - 100W Transistorized amplifier
- 50MHz Converter
- RF front-end for triple conversion GPS receiver
- 2M - 20M transverter
- Improved CMOS RF PLL sythesizer
- Harmonic oscillator
- Direction finder system
- One transistor regenerative receiver
- Synthesized HF receiver
- TBA120 narrowband FM receiver
- TDA7000 receiver
- ZN414 receivers
- 10W HF linear amplifier
- 500W HF linear amplifier
- 3W HF QRP linear amplifier
- Phasing SSB exciter
- 500mW HF linear amplifier
- Generic VHF power amplifier
- 10.7MHz FM detector
- RTTY terminal unit
- Q-multiplier
- CMOS RF PLL sythesizer
- 3W FM Transmitter
- Crystal radio
- Op-Amp Radio
- Class B series modulator
- Advanced VHF power meter
- The MRX-40 Mini Receiver
- External antenna for the GPS-38, Magellan 2000, or Eagle Explorer GPS receivers
- Bug detector
- 175KHz inductive pulse receiver (PDF)
- 200-400 MHz voltage controlled oscillator
- AM/FM/SW active antenna
- RF Sniffer under 0.5MHz to above 500MHz
- Demodulator Schematic/Design
- 73MHz remote controller hallogen light
- CB (27MHz citizens band) receiver
- CB (27MHz citizens band) 2.5W transmitter
- AM to FM conveter
- AM BCB radio receiver
- Regenerative shortwave receiver
- 7MHz SSB Transceiver
- Frequency Synthesizer
- Digital Automatic Gain Control (AGC)
- PLL synthesizing oscillator (1)
- PLL synthesizing oscillator (2)
- PLL synthesizing oscillator (3)
- 2N2222 40 Meter CW/DSB Transceiver
- Yaesu FT-736R doppler compensation
- Phased lock loop schematic
- 30M PSK31 Transceiver
- SOP receiver (PDF)
- SOP direct conversion receiver
- Receiver
- 30m direct conversion receiver
- Popcorn direct conversion receiver
- 40m direct conversion receiver
- 80m direct conversion receiver
- Huge LED Antenna Direction Display (part 1)
- Huge LED Antenna Direction Display (part 2)
- 136 kHz direct conversion receiver
- One Watt 2.45 GHz Linear Amplifier
- 222 MHz Transverter
- VFO from 2001 ARRL Handbook, page 17.74
- VFO from 2001 ARRL Handbook, page 14.20
- Assorted RF circuits
- 14MHz SSB 10mW Transceiver
- Building a Simple LF Exciter
- Yaesu band decoder schematic
- VLF radio receiver schematic
- VLF Upconverter for Shortwave Receiver
- 5 watt, 80 meter QRP CW Transceiver
- How to Build a 300MHz AM, RF Remote Control System
- RF Modem Robotics Project
- PLL FM transmitter
- ICOM CI-V interface with RS232 RTS to PTT
- Improved FM Stereo Modulator
- Morse Code Beacon Keyer
- QRP Antenna Tuner
- Smooth Tone Clickless CW Sidetone Generator
- Smooth Tone Clickless CW Sidetone Generator
- Variety of receiver converter projects
- One transistor FM receiver
- 42 Mc Band to 88 Mc Band (retrofit converter) Project
- Crystal radio circuits including diode performance comparison
- 50MHz Assistant (Preamp & Power Amp.)
- Bug detector
- Basic RF oscillator
- Radio Control Electric Switch
- 56K RF Modem
- 80M ARDF direction finder
- Kenwood TR-7950 manual & schematics (PDF)
Solar-power schematics
- Sun tracking circuit for solar arrays
- Solar power recharger
- Solar power supply
- Photovoltaic Solar Battery Regulator and Load Controller
- Solar charge controller
- Solar robots
- Digital Clock with Timer and Solar Panel Regulator
- Solar Tracker
- 1381 solar engine
- D1 solar engine
- FLED solar engine
- PM1 solar engine
- Solar car array controller schematic
- Solar car battery monitor schematic
- Solar car brake controller schematic
- Solar car main controller schematic
- Solar car display controller schematic
- Solar car electrical design and circuit index
- Portable solar battery charger
- Sensor Electronic Tracker with H-Bridge Drive
- Sensor Electronic Tracker with Simple Solar Charge Controller
- Solar tracking control system
- LED7 solar tracker
- Build a DIY solar iPod charger
- Solar step-down regulator
- Zener-based solar engine
- AA battery solar charger
- AA battery solar charger
- Buck Mode Switching Regulator for Solar Applications
- Solar Panel Charge Controller / Low Voltage Disconnect Circuit
- Solar Panel Current Meter
- Remote Solar LED light
- SCC2 10 Amp Solar Charge Controller
- 12 Volt 20 Amp Solar Charge Controller
- Solar Charged LED Flashlight
- Self Powered Solar Box Furnace
- SPC2 6 Amp Solar Power Center
- Solar Powered Reading Lamp
- AA battery solar charger
- Solar Panel Charge Controller / Low Voltage Disconnect Circuit
- Solar Panel Current Meter
- 5V regulated solar power supply circuit (uses solar garden light solar panels)
- Solar charger for 12V batteries switch switching based on Zetex ZTX 851
- Solar garden light circuit schematic
- Solar cell Nicad charger
- Solar powered dock lamp flasher
Telephone and intercom related schematics
- Telephone recording circuit
- Infinity Transmitter Schematic and Plans
- Digisound ring modulator
- Incoming call indicator
- Telephone Ring Generator Using 60Hz Power Transformer
- Telephone Ring Generator Using Switching Power Supply
- Telephone In-Use LED Indicator
- Telephone In-Use Relay Circuit
- Telephone Audio Interface
- Telephone interfacing / caller ID using a PIC microcontroller
- Home made PBX / PABX
- Ringing Phone Light Flasher
- Phone Busy Indicator
- FM Telephone Bug
- Cut Phone Line Detector
- Simple Phone Tap
- Telephone Hold Button
- Telephone Recorder
- 300 baud modem circuit schematic
- 1-line telephone status indicator (PDF)
- Line in use indicator (PDF)
- 4-line telephone status indicator (PDF)
- Caller ID decoder
- Telephone in use light
- Detecting a telephone RING
- Phone In-Use Light
- Phone to audio interface
- Phone Off-Hook Indicator
- 'phone rang' indicator light
- Phone Line to Audio
- Phone in-use
- Telephone Line Monitor
- Use old phones as an intercom
- Phone-In-Use indicator
- Hold function for Telephone
- Digital/Standard Phone Line Tester
- Caller ID decoder part 1
- Caller ID decoder part 2
- DTMF decoder / logger
- Cellular Phone calling Detector
- Phone line in use indicator
- Telephone music on hold interface
- Soft musical telephone ringer
- Telephone amplifier
- Telephone line monitor
- Cut telephone line detector
- FM telephone line bug transmitter
- Simple telephone line tap for intercepting telephone calls
- The Link A2B+1 (the Link Telephone Intercom - DTMF version)
- The Link 4+0 - Internal Intercom
- The Original 2 Phone Intercom Link Design
- 8-line intercom system using 89C51 microcontroller
- Universal telephone hold
- Talking phone dial monitor
- Simple Skype VoIP analog adapter
- Telephone line simulator
- Telephone privacy adapter
- Telephone ringing circuits
- Simple circuit to connect telephone equipment to audio mixer
- NCDS Interface Schematic for Nokia 3110, 8110, 8110i
- Assorted telephone circuits
- Greek telecard reader
- Isolated Telephone Interface (phone tap)
- Phone ring circuit schematic
- Infinity Bug Schematic (remote telephone surveillance)
- Detect when phone line in use and when two telephones are on the same line
- Cut phone line detector
- Telephone autodialler (usefor for alarm dialler)
- Taxi phone automatic dialler
Test equipment circuit diagrams
- Audible continuity tester
- Wire tracer
- Signal generator for signal tracer
- Electronic level
- Digital volt meter
- Adjustable continuity tested
- RF field strength meter
- Frequency counter
- DCC Ammeter
- High Impedance Voltmeter
- Tri-Waveform Generator
- 220V live wire-in-wall scanner
- Owens Bridge Inductance Measurement Device
- ESR Meter
- Line Output / Flyback transformer tester
- Capacitance meter
- Capacitance meter
- AC Line Current Detector
- Triangle and Squarewave Generator
- Signal tracer / injector
- Conrad Electronics MM3610D multimeter cable pinout
- Grid dip meter
- PCB VSWR bridge
- Electric field & leakage detector
- Simple polarity detector
- RCM710 Electronic Scale
- LASER/LED light output intensity meter (PDF)
- Frequency and capacitance meter
- Elecraft XG2 receiver test oscillator (PDF)
- PIC16F84 based diode tester
- Triple Stroboscope
- Automatic heat limiter for soldering iron
- Ultra-simple voltage probe
- Live line detector
- Continuity tester using transistors
- Latching continuity tester using 4093
- Linear Resistance Meter
- Crystal tester
- Capacitance meter
- Digital voltmeter (DVM)
- Transistor tester
- Function generator
- Triangle / Square wave generator
- Picoammeter circuit schematic with 4 ranges
- Beeper to find short circuits
- MOSFET tester
- Inductive meter adapter
- Crystal tester
- Oscilloscope testing module (Huntron circuit)
- Voltage Monitor
- Logic probe
- TDR cable reflection tester
- Resistor decade box
- Simple light sensor adapter for oscilloscope
- Time Domain Reflectometer (TDR)
- pH Meter
- Multi Wire Cable Tester
- Connection tester
- EMF field probe
- Function generator
- Logic probe
- Zener diode tester
- Mini DDS (direct digital synthesizer)
- AD9850 DDS daughterboard
- Signal Tracer and Injector
- VCR Tuner Based RF Spectrum Analyzer Schematic
- LCD frequency counter (PIC16F84)
- 10Hz - 100KHz D.D.S. Function Generator
- TTL Pulse Reading Logic Probe
- Stereo Test Tone Generator
- Pulse Reading Logic Probe
- Pink Noise Generator for Audio Testing
- Audio Millivoltmeter
- Audio Test Oscillator
- Full Featured Transistor Tester
- Opamp Design and Test Board
- Microphone Circuit Test Oscillator
- Distortion Analyser
- Self Oscillating Amplifier for Distortion Testing
- Capacitance meter that connects to multimeter
- Transistor tester and signal injector
- Continuity tester
- Square wave oscillator (555)
- Capacitance meter
- Continuity tester
- Electrolytic capacitor tester
- RF field strength meter Mk1
- RF field strength meter Mk2 (75MHz to 140MHz)
- LED power meter for testing RF transmitters
- Logic designer and breadboarding system for digital circuits
- Logic probe with integral pulser function
- Logic probe that is essential for servicing digital circuits
- Logic pulser with DIP switch for setting output waveform characteristics
- Build a Magnetic Field Immunity Tester
- 555 Timer IC Tester
- 555 go / no-go tester
- 12V Lead-Acid Battery Monitor
- Continuity tester 2
- Continuity tester
- Logic probe
- Field strength meter for the 137 kHz band
- In-circuit electrolytic capacitor tester
- PIC logic probe with pulser
Timing and oscillator circuits
- Budget timer
- Long period timer
- 555 time delay circuit
- Low frequency clock
- Countdown timer with relay
- DDS using AD9835
- CA4060B Timer Circuits
- Special Function Timer Circuits (LM555)
- 1 Second Time Base From Crystal Osc.
- Power-On Time Delay Relay Circuit
- Low Voltage , High Current Time Delay Circuit
- Power-Off Time Delay Relay Circuit
- Generating a Delayed Pulse With a dual 555 Timer
- Time Delay Relay
- Time Delay Relay
- Line powered 60Hz clock generator (PDF)
- Micro-power pulse generator (PDF)
- Darkroom camera shutter timer
- Divide by 1.5 counter (PFD)
- High-output square wave generator (PDF)
- D Flip-flot one-shot circuits (PDF)
- Clock divider
- Clock doubler
- CMOS oscillator
- Crystal 32.768KHz CMOS Oscillator
- Crystal oscillator
- Cheap 40KHz clock
- Stable 40KHz clock
- 'Rounding Off' a square wave
- Switch debounce using 555
- Square wave to sine wave converter
- Bedside lamp timer
- Sun tanning timer
- Digital Stopwatch 0-99sec
- Digital Stopwatch 0-60sec
- 28 LED clock timer
- Photo timer circuit
- Day / Night / 24 Hour Select Sensor
- One transistor timer
- Variable timer
- Micropower pulse generator (PDF)
- Square wave oscillator
- Triangle wave oscillator
- Sawtooth wave oscillator
- Sine/Cosine wave oscillator
- 555 timer
- 555 oscillator
- Stable multivibrator (IC)
- Stable multivibrator (Transistor)
- Push Button Switch Debouncer
- Square wave oscillator
- 5 to 30 Minute Timer
- NE555 Basic Monostable
- Mini DDS (Direct Digital Synthesis)
- Astable Multivibrator
- High Precision GPS/TV controlled Reference Oscillator
- TV based Receiver for a Standard Frequency Generator
- AD9852 DDS schematic
- A GPS receiver based frequency standard
- Square wave oscillator with fixed frequency steps using 555 timer chip
- Monostable multivibrator
- Clock generator
- 555 Timer Tutorial + Circuits
- Versatile electronic timer
- Digital exposure timer for photography dark room
Transmitter schematics (also see RF)
- Wireless microphone
- XTAL locked tone transmitter
- AM oscillator for wireless microphones
- Wireless microphone
- 1W CW Transmitter
- 433MHz transmitter using SAW resonator
- A 3m (100 MHz) small bug
- Micro Power AM Broadcast Transmitter
- FM Beacon Transmitter (88-108 MHz)
- 1 valve CW transmitter
- 250mW HF CW transmitter
- 2 valve CW transmitter
- Transmitter using LM317
- 5 Watt HF CW transmitter
- Simple FM microphone
- FM bug
- High power FM bug
- 27MHz AM/CW transmitter
- Easy 2-meter transmitter
- QRP HF transmitter
- Spark gap transmitter
- QRP SSB transmitter
- Crystal controlled FM transmitter
- 150mW FM transmitter
- FM transmitter
- 175KHz inductive pulse transmitter (PDF)
- 7MHz QRP transmitter
- Small Radio Transmitter
- FM Telephone Transmitter
- 4 watt FM transmitter
- FM transmitter bug
- Small radio transmitter
- AM transmitter
- 2 Transistor FM Voice Transmitter
- 15 watt FM transmitter
- 4 watt FM transmitter
- Tiny FM transmitter using SMD (surface mount devices)
- Medium range transmitter circuit
- AM FM Simultaneous Transmitter Using Digital IC (CD4001)
- Tracking transmitter
- 5W PLL Transmitter
- Miniature FM transmitter
- Sensitive FM transmitter
- Simple RF transmitter
- 1.5 volt tracking transmitter
- Tracking transmitter
- Micro Power FM Broadcasting Circuits
- Low Power FM Transmitter
- RF/SS Handie Hopper Transmitter Schematic
- Beeper bug transmitter for fox hunt and vehicle tracking
- Guitar FM transmitter
- Very stable RF bug
- Small bug using SMT (surface mount technology)
- Miniature beeper bumper transmitter for vehicle and asset tracking
- Pen bugging device ideal for corporate espionage
- 800 meter (2400ft) range FM transmitter that fits on top of standard 9V battery
- Very stable transmitter than can be carried and move while in use, range is 100-200 meters
- Wireless doorbell for operation on 303MHz, transmit range is around 30 meters (100ft)
- 30-Meter QRP Transmitter for Morse Code
- Miniature FM Transmitter #1
- Miniature FM Transmitter #2
- Miniature FM Transmitter #3
- 4-transistor transmitter
- FM telephone transmitter
- Miniature tracking transmitter
- Light sensing RF transmitter
- 1.5V tracking transmitter
- Micro-Spy with FETs
- Micro-Spy with USW
- Micro-Spy with TTL
- Wireless microphone
Video related schematics
- Video Clock Superimposer
- Video clock superimposer using PIC16C711
- Simple AV (audio / video) wireless transmitter
- Audio / video distribution amplifier
- 10GHz video link
- 8 x 8 Audio-video switch
- VHF/UHF TV modulator
- LH0032 video amplifier
- LM359N video amplifier
- Driver for multiple VGA monitors
- CCD (charge coupled device) support board
- Closed-Caption Decoder
- PIC-Tock video clock
- RGB video digitizer
- Commodore RF modulator
- Video signal edge enhancement
- Video amplifier
- Decoder for encoded transmissions in Videocrypt and D2MAC
- S-Video to RCA adapter
- VGA to SCART adapter
- Television signal amplifier
- Video signal amplifier circuit
- Video/Audio Wireless Transmitter
- 4 Stage 555 Timer for Video Cam Control
- Digital volt meter with video output
- TV/Radio antenna cable galvanic isolator
- S-video to composite video adapter
- VGA converter for video projectors and fixed frequency monitors
- VGA to TV converter
- VGA to PAL and NTSC converter
- PIC micro frame grabber (TDA8708)
- Commodore 64 Video Modulator 251025 Schematics
- Commodore 64 Video Modulator 251696 Schematics
- TV RGB signal output from a SVGA graphics card
- Macrovision removal
- AVR (AT90S2313) composite PAL colour bar generator
- Motorized Video Camera Mount
- Simple motion detecting camer using PIR (passive infrared)
- Homebuilt video digitizer Mark I
- Homebuilt video digitizer Mark II
- TV transmitter (PDF)
