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"A" Weighting Filter For Audio Measurements
"CLONEPAC" memory module for Futaba 8UAF/8UAP
0-10V control for RC servos
1 Second Time Base From Crystal Osc.
1 Watt 2.3 GHz RF Amplifier Using a MRF2001
1.2GHz frequency counter
1.5 Volt LED Flashers
1.5 volt tracking transmitter
1.5V LED flasher A (PDF)
1.5V LED flasher B (PDF)
1.5W Audio amplifier
10 Stage LED Sequencer
10 tricks for interfacing to the PIC16C508
100W Amplifier
100W Audio amplifier
100W Guitar Amplifier
100W HF Linear AMP
100W RMS Amplifier
101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
10MHz to 20MHz laser light detector (PDF)
10W amplifier
12 volt battery monitor
12 Volt Lamp Dimmer
12 volt power supply
120MHz frequency counter
120VAC Lamp Chaser Using Solid State Relays
12B Battery condition indicator
12-Bit ADC interface
12C508 Smart Lock
12V 30A power supply
12V battery capacity tester
12V DC electronic door chime
12V Lead-Acid Battery Monitor
12V Sump Pump Control
12V supply for He-Ne laser
12V to 120VAC inverter
12V to 9V car coverter
12VDC Fluorescent Lamp Driver
12VDC To 120VAC Inverter
13.5KV power supply
136 kHz direct conversion receiver
16 Stage Bi-Directional LED Sequencer
16 Stage Bi-Directional LED Sequencer, other sequencer and flaser circuits
16 Watt amplifier
175KHz inductive pulse receiver (PDF)
175KHz inductive pulse transmitter (PDF)
18W Audio amplifier
1A Variable Regulated Power Supply
1KHz Sinewave generator
1-line telephone status indicator (PDF)
1uS light pulse descriminator plus F to V converter (PDF)
1uS light pulse receiver plus post amp (MISC)
1W CW Transmitter
1W Fluorescent lamp night light (PDF)
2 watt switching power supply
2.3 GHz Power Amplifiers
20 Watt / Channel Stereo Power Amplifier
20 Watt Class-A Power Amplifier
20 Watt GaAaFET Power on 2.3 GHz
200-400 MHz voltage controlled oscillator
20MHz VCSEL 3mW laser test circuit (PDF)
20W Amplifier
220V Flashing lights
220V wiring detector
2304 and 3456 MHz Power Amplifiers
24-bit parallel port interface with 8255 for Commodore computer
24-line PC digital interface (PDF)
25W MOSFET amplifier
28 LED Clock Timer
2-Channel Power Amplifier
2MHz RF Oscillator
2N2222 40 Meter CW/DSB Transceiver
2W amplifier
2W Amplifier
2-wire LCD interface using PIC16CF84
3 - 12 MHz Signal Generator
3 Transistor Audio Amp (50 milliwatt)
300W Subwoofer Power Amplifier
30m direct conversion receiver
30-Meter QRP Transmitter for Morse Code
3-Band equalizer
3KHz low-pass filter plus audio amp (PDF)
3rd brake light
3W FM Transmitter
4 band double-tuned preselector
4 transistor transmitter
40khz IR Tester
40KHz laser burst detector (PDF)
40KHz light receiver (PDF)
40KHz TV-VCR repeater (PDF)
40m direct conversion receiver
418MHz Control RX/TX
42 Mc Band to 88 Mc Band (retrofit converter) Project
4-channel 8-bit analog-to-digital converter for PC
4-line telephone status indicator (PDF)
5 volt power supply
5 watt, 80 meter QRP CW Transceiver
5 Zone alarm circuit
50 MHz frequency counter, voltage meter & SWR/PWR indicator
50 MHz frequency counter, voltage meter & SWR/PWR indicator
50 MHz to 146 MHz Converter
50-150MHz Overtone Oscillator
50MHz Assistant (Preamp & Power Amp.)
50W Amplifier
555 go / no-go tester
555 time delay circuit
555 timer 40khz IR Oscillator
555 Timer IC Tester
555 Timer Monostable Circuit Using Pushbutton
555 Timer Tutorial + Circuits
555 Tone Generator (8 Ohm Speaker)
55W (Originally 75W) Power Amplifier
56K RF Modem
5W Fluorescent light intensity modulator (PDF)
68HC11 based RDS decoder
68HC11 stepper motor control
6-Input mixer
6V to 12V Converter
7 Segment LED Counter
741 Light Sensor
8 note tune player
8 Watt amplifier
8 watt audio amp
80 Meter CW ARDF receiver
80 metre DSB transmitter
80M ARDF direction finder
80m Direct Conversion Receiver
80m direct conversion receiver
80W amplifier
8254 Timer and Counter Board
9 Second Digital Readout Timer
9 Second LED Relay Timer
9-pin null modem cable
9V Xenon photoflash controller (PDF)
A 3m (100 MHz) small bug
A compact L-match ATU for portable use
A dual alternating flashing light circuit
A dual tandem flashing light circuit powered by a 9 volt battery
A Low Cost Thermal Peak Detection Charger
A Miniature High-Rate Speed Control with Brake
A PC-Based LowFER Frequency Synthesizer
A PIC-Based Keyboard Emulator
A Scenix (and PIC) Programmer
A Schottky-based Saw-to-Tri converter
A selection of robotics projects
A Serial Infrared Remote Controller
A Stereo Digital Volume Control based on the CS3310
A two-way Morse practice set
A Visual CW Zero Beating Aid
AA battery solar charger
AA battery solar charger
AC Line Current Detector
AC Line Powered LEDs
AC switching with TRIAC from TTL
Active 2nd Order Filters
Active Sub-Woofer and Controller
Adjustable continuity tested
Adjustable flashing LED
Adjustable power supply using LM317
Adjustable Strobe Light
Air flow detector
Air flow detector
Aladin interface
Alf: The Robotic Matchbox car
AM Broadcast Band Regenerative Receiver
AM oscillator for wireless microphones
AM Radio
AM receiver
AM/FM/SW active antenna
Amplified ear
Amplifier thermal protection
Amplifier timer
An Ambient-Light-Ignoring Infrared Active Motion Detector
An end-fed antenna, L-match coupler and resistive bridge for HF
An Inexpensive X-ray Machine
An On/Off Motor Control with Brake
Analog input section based on AD9220
Analog MIDI synthesizer
Analog opto-isolator
Analog pulse counter
Analog Signal Acquisition for PC Printer Port
Analog Tachometer for Gasoline Engines
Analog to digital conversion notes
Analog VU meter
Astable Multivibrator
AT89C2051 Digital thermometer and clock
AT89C2051 line-follower robot
AT89C2051 Night light saver
AT89C2051 real-time controller
AT89C2051 serial COMs to LED driver
AT89C2051/4051 Driving dot LED
AT89C2051/4051 Easy-Downloader
AT89C2051/4051connecting dumb terminal
AT89C2051/4051scanning 7-segment display and keypad
AT89C2051/4051stepper motor interface
AT89C51/52/55 Easy-Downloader
Atmel 8051 Flash Based-Microcontroller Programmer
Atmel 89C Series Flash Microcontroller Programmer
Audible continuity tester
Audible metronome
Audio / video distribution amplifier
Audio Amp Output Power Limiter
Audio amplifier output relay delay
Audio Graphic Equaliser
Audio graphic equaliser
Audio level indicator
Audio line isolator
Audio Millivoltmeter
Audio mixer
Audio notch filer
Audio output level meter
Audio preamp
Audio preamp circuits
Audio preamplifier
Audio Test Oscillator
Audio-video switch
Automated crib lights
Automatic door opener (PIC)
Automatic door opener with PIC12C508
Automatic message sender for CB
Balanced Line Driver & Receiver
Barcode scanner
Basement doorbell beeper (PDF)
Basic FM Transmitter
Basic increase in DC voltage
Basic op-amp circuits
Basic RF oscillator
Bat detector
Battery charge indicator
Battery low voltage alarm
Battery low voltage alarm 2
Battery pack discharger
Battery voltage monitor
Bedside lamp timer
Bell ring generator
Bias Tee
Bi-Directional 2.4 GHz One Watt Amplifier
Bi-Directional 900Mhz One Watt Amplifier
Bidirectionall power inverter
Big Mouth
Bingo!!! (on your tv)
Black Light
Block power switching module
Breath Alcohol Tester controlling a car ignition system
Bridging Adapter For Power Amplifiers
Broadband 2MHz optical fiber receiver (PDF)
Broadband 5MHz optical fiber receiver (PDF)
Budget timer
Bug detector
Bug detector
Build a Magnetic Field Immunity Tester
Build a PIC controlled DDS VFO, 0 to 6 MHz
Build an Infrared night scope
Build logic gates using discrete parts
Build Your Own Digital Setting Circles For Your Astronomical Telescope
Building an RF Remote Control System
Burglar alarm
C-52 EVB Robot Controller
Caller ID decoder
Capacitance meter
Capacitance sensor
Capacitance type liquid level measurement (PDF)
Car battery charger
Car clock
Car interval wiper
Car message display
Car Nicad charger
Car radio tunes the Amateur Bands
Casio datalogger
Casio organiser hardware
Centronics port D/A converters and low-pass filter
Chaos generator
Charge coupled bi-directional power MOSFET relay (PDF)
Charger for gel lead acid batteries
Cheap 40KHz clock
Chebyshev / Butterworth filters
Cigarette lighter 9V adaptor
Circuit that momentarily closes a pair of contacts at long intervals
Clock divider
Clock doubler
Clock generator
Closed-Caption Decoder
CMOS IC audio oscillator
CMOS oscillator
CMOS Toggle Flip Flop With Relay(CD4013)
CO2 controller for planted tanks
Code practice oscillator
Cold activated switch
Colour (Sound) Organ
Combination-controlled, fully customizable RF remote control
Compact 20 14 MHz direct conversion receiver
CompactFlash to IDE interface
Compost temperature and moisture monitor
Compter microphone
Computerize Your Room/Home
Condenser microphone hookup
Connect other circuits to PC joystick port
Connect two CD-ROM drives to one soundcard
Connecting PIC12C508 8 to 93AA46 serial eprom
Constant Current Battery Charger
Constant Temperature Circuit
Continuity tester
Continuity tester 2
Control 120VAC relay with TTL
Convenient PIC module
Convert Atari-style joystick to PC joystick port
Coutesy lamp
Cranial Electrotherapy Stimulator
Crystal 32.768KHz CMOS Oscillator
Crystal oscillator
Crystal radio
Crystal radio
Crystal radio
Crystal set that requires no antenna
Current loop interface
Cut Phone Line Detector
Cut phone line detector
CW RECEIVER 40/80 meter CW receiver
D Flip-flot one-shot circuits (PDF)
D.C. Mixer for music synthesizers
Dark activated switch
Darkness monitor
Darkroom camera shutter timer
Datalogger based on 68HC11
DC Accurate, Active RC Lowpass Filter
DC Motor-Driver H-Bridge Circuit
DC Push Button Motor Control Circuit
DC-DC Power Supply from car 12V battery to PC motherboard
Death of Zen (DoZ) - A New Class-A Power Amp
Decoding IR Remote Controls
Deluxe charge rate monitor
Detect fan failure with a single transistor
Detecting a telephone RING
DGPS receiver
Digisound ring modulator
Digital Call Sign Annunciator
Digital combination lock
Digital Delay Unit For Surround Sound
Digital noise generator (PDF)
Digital PC Oscilloscope
Digital thermometer
Digital volt meter
Digital volt meter with video output
Digital volume control
Digital/Standard Phone Line Tester
Diode Laser Power Supplies
Diode Laser Power Supplies
Dip Oscillator for HF
Direct Injection Box for Recording & PA Systems
Disco style Strobe Light
Discrete Bistable Flip Flop
Discrete Set/Reset Flip Flop
Distortion Analyser
DIT shutterglasses controller
Divide by 1.5 counter (PFD)
Do-it-Yourself VGA ro PPrPb Cable
Door knob alarm (PDF)
Doorphone intercom
Driver for multiple VGA monitors
Driving a relay with a CPU
Drum machine
Drum tone oscillators
DTMF tone decoder using Basic Stamp
Dual comparator forms temperature-compensated proximity detector
Dual phantom power pre-amp
Dual PIC16C84 prototype board
Dual Polarity Power Supply
Dual regulated power supply
Dual Voltage Controlled Filter w/Modulator
Dual Voltage Controlled Oscillator w/Modulator
Dynamic microphone to electret microphone input
ECG Amplifier
ECM Mic preamp
Economoy short-wave radio
Economy radar detector
El-Cheapo - A Really Simple Power Amplifier
Electret mic amplifier
Electret microphone powering circuits
Electric field & leakage detector
Electric field disturbance monitor
Electric field disturbance monitor
Electromagnetic field detector
Electromagnetic Levitator
Electronic auto stethoscope
Electronic canary
Electronic coin tosser
Electronic craps game
Electronic Dazer
Electronic door codelock with PIC16F84
Electronic fish lure
Electronic level
Electronic lock
Electronic metronome
Electronic night light
Electronic siren
Electronic thermostat
Electronic Thermostat Relay Circuit
Electronic whistle
Electroscope
ELF Monitor
Embedded controller based on MC68HC11F1
Embedded system to send e-mails (small TCP/IP stack)
EMF field probe
ESR Meter
ETI 603 Sequencer
Expandable 16 Stage LED Sequencer
Experimental data transmitter for fiber optics
Experimental fiber optic receiver
Experimental laser data link
Experimental macrovision remover
Fading Red Eyes
Fake Joystick circuit
Fantastic Atom Expander
Fast Audio Peak Limiter
Fax to modem interface
FCTS Project
FET audio mixer
Field strength meter
Filter Circuit for the Earthworm Seismic Data Acquisition System
Filtering PC bus POWER
Finger touch activated switch (PDF)
First response monitor
Fixed Voltage Power Supply
Flash slave trigger
Flashing Christmas LED display
Flashing High Intensity LED 3rd Brake Light
Flashing LED advertising badge (PDF)
Flashing neon christmas lights
Flashing Neons (NE-51 / NE-2)
Fluid level detector
FM Beacon Transmitter (88-108 MHz)
FM Bug
FM Telephone Bug
FM telephone bug
FM Telephone Transmitter
FM transmitter
FM transmitter
FM transmitter
Fogger smoke machine
Four channel fuzz box
Four Channel Wireless Transmitter and Receiver
Freign vocabulary recollector
Frequency agile 80m CW QRP transmitter
Frequency and capacitance meter
Frequency counter
Frequency Synthesizer
Fridge door alarm
Full Featured Transistor Tester
Full-duplex doorphone
Function generator
Furby circuit
Fuse blown indicator
Galaxy Noise Filter
GameBoy Camera Parallel Port Interface
GameBoy Cart Programmer
GameBoy LCD schematic
GameBoy MBC1 circuit equivalent
GameBoy Power & Cartridge schematic
GameBoy ROM+RAM+MBC1 Cart Schematic
GameBoy Schematic
Gate alarm circuit
Geiger counter
General purpose 48-bit ISA parallel I/O card
General purpose IR receiver
Generate video signals in real-time using a PIC16F84
Generating -5VDC from +5VDC
Generating a Delayed Pulse With a dual 555 Timer
Generating Negative 5 Volts from 9 Volt Battery
Genius Mouse schematics
Get power out of PC parallel port
Get power out of PC RS-232 port
Getting power from RS-232 interface
Glitch detector
Glow Plug driver for model engines
Griffith Observatory Tesla Coil
Guitar fuzz effect
Guitar Reverb Pedal
Guitar Tremolo Unit
Guitar Vibrato Unit
Gyrator circuit
H Bridge Motor Control Circuits
HamComm Interface
Hardware random bit generator
HeadBanger Headphone Amp
Headlight On reminder with Light
Headlight reminder
Headphone amplifier
Headphone amplifier
Headphone distribution amp
Headphone driving circuit for soundcards
Headphone monitor amp
Hear Amateurs on your FM Radio!
Hear Amateurs on your Shortwave Radio!
Heartbeat monitor
Heartbeat transducer
HeNe laser power supply
HeNe laser power supply schematics
HEXBOT robot
HF Linear RF power amplifier
Hi Fi preamp
Hi-Fi Headphone Amplifier
Hi-Fi PC Speaker System
High Current Power Supply
High Current Regulated Power Supply
High Quality Sound Mixer
High speed 20MSPS ADC interface
High Voltage High Current Power Supply
High-output square wave generator (PDF)
High-speed light receiver (PDF)
Hold function for Telephone
Honey Bee counter (PDF)
Horror movies sound effects
How to Build a 300MHz AM, RF Remote Control System
How to get power from PC to your circuits
http://www.rentron.com/SerialServo.htm
http://www.vekoll.vein.hu/~jap/electronic/codelock.html
HV supply: 12VDC in, 12KV out
I2C printer port adaptor
ICL7660 LED flasher
Icom CT-17 Logging & Control Interface Level Converter
IDE hard-disk interface for Amiga 500
Implementing Infrared Object Detection
Improved PL tone decoder
Improved saw to triangle converter
In-circuit electrolytic tester
Incoming call indicator
Infra/radio remote control transmitter/receiver with PIC
Infrared body heat detector
Infrared gate detector
Infrared relay with relay output
Infrared remote transponder
Infrared repeater
Infrared transmitter for locomotives
Intercom preamp
Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
Interface cables for various cell phones
Interfacing 16x2 character :LCD to parallel port
Interfacing 5 volt CMOS to 12 volt loads
Interfacing piezo elements to a microcontroller
Interfacing Sony control stick to Empeg
Interfacing the PIC16C508
Intermittent alarm generator
Ion detector
Ion detector
IR detector
IR detector / emitter
IR Illuminator
IR Laser light detector
IR Ranging
IR Receiver (Amplitude Modulated IR)
IR remote control
IR remote control extender
IR remote control system for PC
IR remote control tester
IR Transmitter for Audio (Amplitude Modulated IR)
ISA 48 I/O digital card
ISA 8-bit output card
Isolated Full Duplex RS232C Interface
Isolated RS232 for PIC16F84
Jacob's Ladder
JFET crystal testing oscillator
Joigging timer
Kirlian device supply
Lamp flasher/dimmer
Laptop Computer Serial Port Power Booster
Laser bug circuit
Laser diode transmitter
Laser power supply
Laser transmitter/receiver
LASER/LED light output intensity meter (PDF)
Latching relay driver
L-Band PHEMT LNA
LC filter design
Lead acid trickle charger
LED Audio VU Meter
LED Battery Condition Indicator
LED chaser
LED Flasher
LED flashing light
LED initials
LED Mood Light
LED Mood Light
LED Photo Sensor Circuit
LED pulser with audible output
LED RF Signal Meter
LED traffic lights
LF to HF Converter
Light Activated Relay
Light activated relay
Light beam receiver for laser pistols
Light detector
Light detector
Light direction sensor
Light sensing RF transmitter
Light Sequenced Candelabra
Light/dark detector
Lightning Activated Camera Shutter Trigger
Line in use indicator (PDF)
Line level signal to microphone input adapter
Line Output / Flyback transformer tester
Line powered 60Hz clock generator (PDF)
Linearized RF detector
Line-powered Xenon flash transmitter (PDF)
Linkwitz Cosine Burst Generator
Linux Infra-red Remote Control (LIRC)
Live line detector
LM 1800 FM stereo decoder
LM317 adjustable power supply
LM317 Regulator With Pass Transistor
LM317 Variable Voltage Regulator
LM358 preamp
LM383 12V Amplifier
LM3909 LED flasher
LM3911 temperature controller
LM3914 battery monitor
Load Sensing Automatic Switch
Logic probe
Logic probe
Long period timer
Long-period watchdog timer
Loudspeaker Protection and Muting
Low battery voltage flasher (PDF)
Low current LED flasher (PDF)
Low frequency clock
Low Frequency Sinewave Generator
Low impedance microphone amplifier
Low Noise Balanced Microphone Preamp
Low Noise Microphone Preamplifier
Low Power DC to DC Converter
Low Power FM Transmitter
Low Power LED Voltmeter
Low Power LED Voltmeter
Low Power Op-Amp - Audio Amp (Intercom)
Low Voltage , High Current Time Delay Circuit
Low voltage DC motor speed controller
Low-level audio amp
Low-power optical interrupter (PDF)
LTC1265 Nicad charger
LX-800 Lighting system
Machine power loss beepter (PDF)
Machine vibration triggers hour meter (PDF)
Macrovision code remover
Magnetic cartridge amplifier
Magnetic levitation circuit
Mains clock controller using AT89C2051
Many video amplifier circuits includiing transmission over UTP (PDF)
Mark II video digitiser
MAX924 bar-graph level gauge
MC1374 based TV transmitter
Memory game
Metronome and pitch generator
Micro Power AM Broadcast Transmitter
Micro Power FM Broadcasting Circuits
Microcontroller interface for 5KW microwave oven
Microphone amplifier
Microphone Circuit Test Oscillator
Microphone mixer
Micro-power 40KHz burst laser diode driver (PDF)
Micropower Event Transmitter
Micro-power over temperature alarm (PDF)
Micropower pulse generator (PDF)
Micro-power pulse generator (PDF)
Microprocessor RS-232 Reset
Micro-Spy with FETs
Micro-Spy with TTL
Micro-Spy with USW
MIDI to CV interface
Mini metronome
Miniature FM transmitter
Miniature FM Transmitter #1
Miniature FM Transmitter #2
Miniature FM Transmitter #3
Miniature loop alarm
MiniLOGGER V1.0
Minimalist Discrete Hi-Fi Preamp
Modem Rockwell RCV336/ACF model V1433VQR ext.
Modular relay system
Modulated laser diode tester (PDF)
Modulated light received (PDF)
Moisture alarm
Monostable Flip Flops (one shot)
More accurate PC/AT clock
Morse Adaptor for your VHF/UHF FM rig
Morse Code Beacon Keyer
Morse Code Practice Keyer 1
Morse Code Practice Keyer 2
Motorcycle turn-signal system
MS Stereo Decoder
MS Stereo Microphone
Multi-chip programmer
Multiple Feedback Bandpass Filter
Multiple voltage power supply
Muscular Bio-stimulator
Musical Instrument (Expandable) Graphic Equaliser
MW preamplifier
NASA TURFTS - TDRSS User RF Test Set
NCDS Interface Schematic for Nokia 3110, 8110, 8110i
NE555 Low Voltage Battery Disconnect Circuit
Negative ion generator
Negative voltage generator
Network of RS485 temperature sensors
Nicad battery charger
Nicad Battery Discharger/Capacity Indicator
Night light saver (PIC12C508)
Nocturnal animals whisker
Noise generator
Nokia 3210 MBUS interface
Nokia 51xx interface cables
Null Printer Adapter
Octave screamer
Old-fashioned siren effect
One transistor FM receiver
One Valve CW transmitter
Op-amp based FM transmitter
Opamp Design and Test Board
Op-Amp Radio
Optical sensor using PIC12C508
Optical Theremin - electronic musical instrument
Paradoxical Sound Syntheizer
Parallel (Printer) Port Interface
Parallel port ADC based on MAX147
Parallel port ADC using ADC0804
Parallel port ADC/DAC
Parallel port relay interface
Parallel port servo controller
Parallel print capture system
Parametric And Sub-Woofer Equaliser
Parking sonar
PC based 7-segment rolling display
PC Based Digital Storage Oscilloscope Mk3
PC based EFI programmer
PC IR receiver based on PIC16F84
PC IR Remote Control
PC serial port receiver
PC speaker volume control circuit
PC thermometer
PC-Based Digital Storage Oscilloscope (DSOA)
Peak reading audio level meter
Peak-reading meters
Pedometer
Perimeter monitor
Personal silent alarm system
Personal stereo audio amp
pH meter with calibration
Phase Shift Radio Direction Finder
Phase shifter
Phased lock loop schematic
Phone Busy Indicator
Phone in use circuit
Phone in-use
Phone In-Use Light
Phone Line to Audio
Phone Off-Hook Indicator
'phone rang' indicator light
Phone to audio interface
Phone-In-Use indicator
Phono preamp
Phono Preamp
Phono Preamps For All
PIC 5x7 display
PIC controlled DDS VFO, 0 to 6 MHz
PIC logic probe with pulser
PIC Project #1 - RS232 to I2C Interface
PIC R/C Servo Controller
PIC12C508 Night-light saver
PIC16C84 VT-52 Emulator for Linux
PIC16F84 Based Morse Code Reader
PIC16F84 debugging terminal
PIC16F84 line following robot
PIC16F84 mechanically scanned clock
PIC16F84 miniature real-time controller
PIC16F84 programmer
PIC16F84 Range Finder Project
PIC16F84 Serial I/O-expander with PicBasic
PIC16F84 sound controlled Christmas lights
PIC16F84/PIC16F87x-In-System-Programmer
PICADC - a free, PIC based "intelligent" A/D converter
PIC-FC1 Frequency Counter
PIC-Programmer 2
PIC-Tock video clock
Picxie 2 - 8x8 Animated LED Signboard
Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
Pine Racecar Victory Judge
Pink Noise Generator for Audio Testing
PIXpand
Plane locator
Plane locator 2
Plant watering watcher
Popcorn direct conversion receiver
Portable 40W CW transmitter
Portable CD Player Adapter For Car
Portable headphone amplifier
Power Amplifier Clipping Indicator
Power reminder beeper (PDF)
Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
Power Tool Torque Control
PowerGlove Interface
Power-line Appliance Controller
Power-Off Time Delay Relay Circuit
Power-On Time Delay Relay Circuit
Precision audio millivoltmeter
Printer port ADC
Programmable light-activated relay
Project: NES to Atari 2600 controller interface
Proximity alarm
PSX controler to PC MIDI converter
Pulse Reading Logic Probe
Pulse Shaping on the Palm Pilot
Pulse Width Modulation DC Motor Control
Pulse width modulators (PWM)
Pulse width to voltage converter
Pulsed double-heterostructure laser driver
Pulsed LED test circuit (PDF)
Push Button Switch Debouncer
Pushbutton one-shot and latch (PDF)
Push-Pull Class A 2A3 Stereo Amp
Push-Pull Class A Amp using type 5687 dual triodes
PWM DC Motor Speed Control
PWM light bulb regulator
PWM Motor Speed Controller / DC Light Dimmer
PWM Motor/Light Controller
PWM Motor/Light Controller
PWM Motor/Light Controller variants
Pyroelectric Infrared Sensor
Quiz show indicator
R/C Receiver <-> Joystick Port Interface for Flight Simulators
R-399-A Communications Receiver
Radiation Dosage-Rate Meter
Radio Control Battery Backup
Radio Control Electric Switch
Rain detector
Random noise generator
RC Notch Filter (Twin T)
RCM710 Electronic Scale
RDS Encoder
RDS Encoder - digital part
Receiver
Receiver building blocks
Regenerative shortwave receiver
Regulated 12V supply
Relay delay circuit
Remote control encoder/decoder with PIC16C620 & PIC12C508
RF actuated CW monitor
RF Modem Robotics Project
RF Power Meter for the QRPer
RF Sensing relay driver
RF Sniffer <.5 to >500 MHz
RIAA Equalized Stereo Phono Preamp
RIAA phono amplifier
Ringing Phone Light Flasher
Room noise detector
'Rounding Off' a square wave
RS 485-RPT Schematic
RS-232 Laser Transceiver
RS-232 line monitor and loopback cables
RS-232 surge protection
RS232C Level Converter
RS485-Version of the SAB80C535-Microcontrollerboard
Safety indicator light
Saw to triangle converter
Scaling ADXL50 accelerometer outpu
ScanMate audio activated recorded
Schematic of a standard PC joystick
Sega 3D glass interfacing circuits
Self Oscillating Amplifier for Distortion Testing
Sensitive FM transmitter
Sensor Electronic Tracker with H-Bridge Drive
Sensor Electronic Tracker with Simple Solar Charge Controller
Sequencing Neons (NE-51 / NE-2)
Serial Port A/D-converter
Serial to ECP interface
Serial to parallel converter using the AT89C2051
SHARP palm-top/hand-held to RS232 serial converter
Short-circuit beeper
Shortwave conveter for scanners
Signal Detecting Auto Power-On Unit
Signal generator for signal tracer
Signal tracer & injector
Signal tracer / injector
Simple +5V power supply circuit
Simple 6-Digit 40MHz Frequency Counter Module
Simple alarm system
Simple BFO metal detector
Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
Simple Car Preamplifier and Artificial Earth
Simple charge rate monitor
Simple circuit to connect telephone equipment to audio mixer
Simple colour organ
Simple DC Adapter Power Supply
Simple event counter
Simple field strength meter
Simple flashing light circuit
Simple flashing light circuit
Simple flashing light circuit
Simple infra-red detector
Simple infrared remote control
Simple IR transmitter circuit
Simple laser communicator
Simple lie detector
Simple light sensor adapter for oscilloscope
Simple line mixer
Simple microphone preamplifier
Simple microphone preamplifier
Simple MIDI tester
Simple MIDI-to-CV converter
Simple nitrogen spark generator (PDF)
Simple Op-Amp Radio
Simple PC SmartCard reader
Simple pH meter
Simple Phone Tap
Simple polarity detector
Simple RF transmitter
Simple RS-232 serial port buffer circuit
Simple RS232C Level Converter using Transistors
Simple Surround Sound Decoder
Simple train detector using ambient light and a photocell
Simple TV transmitter
Simple two line output combiner
Simple UHF dummy load
Simple Variable Voltage Source
Simple VOX circuit
Simplest Ever Amplifier Bridging
Simulate the Gyralite (dual flashing headlights).
Sine wave generator
Single cell lithium battery charger
Single Chip 50 Watt / 8 Ohm Power Amplifier
Single Ended Class A2 SV811-10 Stereo Amp
Single-Supply Twin T Butterworth Low Pass Filter
Slot car TV cronograph
Small Radio Transmitter
Smart battery charger
Smooth Tone Clickless CW Sidetone Generator
SN754410 Dual Motor Driver Board
Soft-Start Circuit For Power Amps
Solar cell Nicad charger
Solar Charged LED Flashlight
Solar Panel Charge Controller / Low Voltage Disconnect Circuit
Solar Panel Charge Controller / Low Voltage Disconnect Circuit
Solar Panel Current Meter
Solar Panel Current Meter
Solar power recharger
Solar power supply
Solar Tracker
Solenoid starter
Solid state relay (PDF)
Some simple test equipment to build
SOP direct conversion receiver
Sound amplifier
Sound Blaster Microphone Preamplifier
Sound detector
Sound level meter
Sound operated switch
Sounds effects unit
Spark-gap transmitter
SPDIF-interface to AudioPCI
Speaker signals to line level inputs
Speaking clock using PIC & ISD device
Speaking doorbell using PIC & ISD device
Speed limit alert
Spread spectrum transceiver controlled by PIC
Spring reverb
Spring reverb unit
Spring reverb unit
Spring Reverb Unit For Guitar
Square wave oscillator
Square wave to sine wave converter
Stable 40KHz clock
Staircase wave generator
Stepper motor controller
Stepper motor positioner
Stereo compressor
Stereo Ducker
Stereo IR audio receiver
Stereo line driver
Stereo Width Controllers
Strain gauge sensor
Strobe light
Subwoofer Equaliser
Sun tracking circuit for solar arrays
Super 80 ultra-simple SSB receiver for 3.5 MHz
Super GameBoy schematic
Superregenerative 27MHz receiver
Supervisory Control And Data Aquisition project (for Home Automation and Security)
S-video to composite video adapter
Switch debounce using 555
Switching solenoid driver
Switch-on delay circuit
Synthesizer schematics
Talking phone dial monitor
Talking PIC - based on SP0256
Talking receiver
Talking YODA project (PIC16C84)
Tan timer
TCP/IP stack and WWW server in a PIC16F84
TDA2030 8 Watt amplifier
Telephone Audio Interface
Telephone Hold Button
Telephone in use light
Telephone In-Use LED Indicator
Telephone In-Use Relay Circuit
Telephone Line Monitor
Telephone line simulator
Telephone privacy adapter
Telephone Recorder
Telephone recording circuit
Telephone Ring Generator Using 60Hz Power Transformer
Telephone Ring Generator Using Switching Power Supply
Telephone ringing circuits
Temperature compensated pH meter
Temperature controlled based on AT89CX051
Temperature Controlled NICD Charger
Temperature monitor
Temperature sensitive oscillator
Tesla coil / HV generator
Tesla power receiver
The ESP SIM (Sound Impairment Monitor)
The MRX-40 Mini Receiver
Theremin controller
Thermoelectic controller (scriptable thermometer)
Thermo-Fan To Keep Your Amp Cool
Three input first response monitor
Tilt sensor for the PalmPilot
Time Delay Relay
Time Delay Relay
Time Domain Reflectometer (TDR)
Time to dust indicator (PDF)
Timed beeper
Tone control
Tone control
Tone detector
Tone generator
Toroidal coil RF shortwave receiver
Touch activated alarm system
Touch Activated Lamp
Touch switch
Touch switch
Touch Switches
Tracking transmitter
Transformerless Power Supply
Transisor organ
Transistor relay driver
TRF AM Receiver circuit
TRIAC light dimmer
Triangle and Squarewave Generator
Tri-Waveform Generator
Turn signal alarm
TV transmitter
TV/Radio antenna cable galvanic isolator
Two Tone Audio Oscillator (use for SSB tests)
Two tone train horn
Two transistor audio amplifier
Two Transistor LED Flasher
Two Valve 40m CW Transmitter
Two-band radio
Two-tone siren
Two-tone siren
UHF - 100W Transistorized amplifier
UHF oscillator
Ultimate battery low voltage alarm
Ultra Simple Bass Guitar Compressor
Ultrasonic dog whistle
Ultrasonic generator
Ultrasonic Range & Imager
Ultrasonic range finder circuit
Ultrasonic remote control & alarm system
Ultrasonic sound receiver
Ultrasonic switch
Ultrasonic transducer oscillator circuit
Ultrasound detector
Underwater microphone
Universal IR-Remote Lamp Controller
Universal telephone hold
Unplugged power cord alarm
Unregulated power supply
USB to infrared adapter
Use amplifier phono input as line level input
Use old phones as an intercom
Using the 78xx Series Voltage Regulators
Using the joystick port as general purpose input
Variable 3 - 24 Volt / 3 Amp Power Supply
Variable Amplifier Impedance
Variable DC power supply
Variable Dual Lab Power Supply
Variable power supply
Variable Voltage and Current Power Supply
Variety of quick designs
Variety of receiver converter projects
Varying Brightness AC Lamp
Versatile electronic timer
Very basic circuits
Very loud beeper (PDF)
VGA converter for video projectors and fixed frequency monitors
VGA to PAL and NTSC converter
VGA to TV converter
Vibrating pocket bug detector
Video amplifier
Video digitiser
Video signal amplifier
Video signal edge enhancement
Video switcher
Video switcher (PDF)
Visual metronome
Vocal zapper
Voice record/playback using ISD 1000A
Voltage comparator switch
Voltage controllable LFO
Voltage controlled amplifier
Voltage Controlled Mixer w/Modulator
Voltage Controlled Panner
Voltage doubler
Voltage Inverter
Voltage Inverter
Voltage inverter
Voltage probe
Vox AC30 Guitar Amplifier Simulator
VU And PPM Audio Metering
Warbler
Water seepage alarm (PDF)
Water-level sensor
Web-based thermometer project
Weign Bridge generator
Whistle detector using 8-pin PIC
Whistle responder
White noise generator
Wide-swing Variable Crystal Oscillator
Winking LEDs
Wire tracer
Wireless Auto Tachometer
Wireless event receiver
Wireless IR headphone receiver
Wireless IR headphone transmitter
Wireless Liquid Level Sensing for Restaurant Applications
Wireless microphone
Wireless microphone
Wireless microphone
Wireless motion detector
Xenon Strobe Light
XTAL locked tone transmitter
Z80 core #1- Z80 CPU and memory (PDF)
Z80 core #2- Z80 CTC and SIO
Z80 core #3- RS-232 drivers for the SIO
Zener diode tester
ZN414 AM receiver
ZN414 shortwave receiver