All Circuits


- 0-50V 2A Bench power supply Circuit
- 100W RMS Amplifier Circuit
- 10 Amp 13.8 Volt Power Supply Circuit
- 10W Audio Amplifier with Bass-boost Circuit
- 10W Mini Audio Amplifier Circuit
- 12 to 120 Volt Inverter Circuit
- 12VDC Fluorescent Lamp Driver Circuit
- 12VDC Fluorescent Lamp Driver
- 12 Volt 30 Amp PSU Circuit
- 12 Volt 30 Amp PSU
- 13 Volt 20 Amp PSU
- 1.3 Volt Power Source
- 150W MP3 Car Amplifier
- 15 Watt Amplifier
- 15W Fm-transmitter Circuit
- 18W Audio Amplifier Circuit
- 1KHz Sinewave Generator Circuit
- 200W audio amplifier Circuit
- 20dB VHF Amplifier Circuit
- 220 Volts Flashing Lamps Circuit
- 22 Watt Audio Amplifier Circuit
- 24 Hour Timer Circuit
- 24 Hour Timer
- 24 Second Shot Clock Circuit
- 24 Second Shot Clock
- 24 Watt Class A Amplifier
- 25W Mosfet audio amplifier Circuit
- 28 LED Clock Timer Circuit
- 2N3055 Power Amplifier Circuit
- 2SC1946A 30 Watt VHF Amplifier
- 2 Transistor FM Voice Transmitter Circuit
- 2 Transistor FM Voice Transmitter
- 2 Transistor Transmitter
- 2 Watt Audio Amplifier
- 3 Band graphic equalizer
- 3 Channel Spectrum Analyzer Circuit
- 3 Channel Spectrum Analyzer
- 3 Line Mixer Circuit
- 3W FM Transmitter Circuit
- 40W Fluorescent Lamp Inverter
- 4 Band Double Tuned Preselector
- 4 Transistor Transmitter
- 4W FM Transmitter Circuit
- 5,000W ultra-light, high-power amplifier, without switching-mode power supply Circuit
- 500W low cost 12V to 220V inverter Circuit
- 50 Watt Amplifier Circuit
- 555 Pulse Generator
- 5 to 30 Minute Timer Circuit
- 5 to 30 Minute Timer
- 5 Zone Alarm Circuit
- 60W Bass Amplifier Circuit
- 60W Guitar Amplifier Circuit
- 60W Linear amplifier Circuit
- 6 Channel Auto Reverse Sequential Disco Running Lights Circuit
- 6 Input Mixer
- 6V to 12V Converter Circuit
- 6V Ultra-Bright LED Chaser Circuit
- 6 x 6 Loop Antenna
- 73 MHz Hallogene Lamp Radio-Controlled Circuit
- 7 Segment LED Counter Circuit
- 8 Line Intercommunication using 89c51 Circuit
- 8 Random Flashing Leds Circuit
- 8 Watt Amplifier
- 9 Volt 2 Amp Power Supply
- AC Current Monitor Circuit
- Adjustable High/Low Frequency Sine wave generator Circuit
- Adjustable Power Supply with Charger Output
- Adjustable Strobe Light Circuit
- Adjustable Strobe Light
- Air Flow Detector Circuit
- Alarm Power Supply
- AM FM Simultaneous Transmitter Using Digital IC Circuit
- Amplified Ear Circuit
- Amplifier 2x30W with STK465 Circuit
- Amplifier of acoustic frequencies with preamplifier Circuit
- Amplifier Timer Circuit
- Amp with Tone Controls & Soft Switching
- AM Receiver Circuit
- AM Receiver
- AM To FM converter Circuit
- AM Transmitter Circuit
- AM Transmitter
- An Add-on Current Limiter
- Antenna Tuning Unit
- A small FM transmitter (SMD) Circuit
- Asymmetric Timer Circuit
- Asymmetric Timer
- ATMEL 89 Series Flash Microcontroller Circuit
- Audio Indicator
- Audio Level Meter (vumeter) Circuit
- Audio Level Meter
- Audio Line Driver
- Audio Notch Meter
- Audio Perimeter Monitor
- Audio VU Meter
- Auto Heat Limiter for Soldering Iron Circuit
- Automatic Headlight Brightness Switch Circuit
- Automatic Loudness Control Circuit
- Automatic Retransmitting Makeshift Repeater
- Automotive 12V to +-20V converter (for audio amplifier) Circuit
- Band 2 Preamplifier
- Basic UPS Power Supply Circuit
- Basic UPS Power Supply
- Bass-treble tone control circuit Circuit
- Batteries charger & PSU - ideal for digital cameras Circuit
- Battery-powered Night Lamp Circuit
- Beat Balance Metal Detector
- Bedside Lamp Timer Circuit
- Beeper to find short circuits Circuit
- Bench Amplifier
- Bicycle back Safety Light Circuit
- Bipolar Regenerative Reciver
- Black Light Circuit
- Brightness Control for small Lamps Circuit
- Buffer Amplifier
- Capacitance Meter Circuit
- Capacitive Sensor Circuit
- Car Battery Charger Circuit
- Cellular Phone calling Detector Circuit
- Class-A-AB Amplifier
- Coil Coupled Operation Metal Detector
- Color Organ
- Combinational Conjuring Trick
- Complete Radio Set with MK484 and Loudspeaker
- Computer Microphone
- Conjuring Trick
- Connection Tester
- Continuity Tester Circuit
- Control Electrical Appliances Using PC Circuit
- Courtesy Light Circuit
- Crystal Tester Circuit
- Cuckoo sound Generator Circuit
- Current Limiting Power Supply
- Cut Phone Line Detector Circuit
- Dancing LEDs Circuit
- Dark-activated LED or Lamp Flasher Circuit
- Dark Activated Switch
- DC Motor Control Circuit Circuit
- DC Motor Control Circuit
- DC Motor Reversing Circuit Circuit
- DC Motor Reversing Circuit
- Decimal to BCD Convertor
- Deluxe Charge Rate Limiter for Small Capacity NiCad Batteries Circuit
- Digital Combination Lock
- Digital Radar Speedometer Circuit
- Digital Remote Thermometer Circuit
- Digital Step-Km Counter Circuit
- Digital Stopwatch 0-60sec Circuit
- Digital Stopwatch 0-99sec Circuit
- Digital Voltmeter Circuit
- Digital Volume Control Circuit
- Discharger for Receiver Battery Packs Circuit
- Dome Lamp Dimmer Circuit
- Door Alarm Circuit
- Doorbell for the Deaf
- Doorphone Intercom
- Downed Model Locator Circuit
- Downed Model Locator II Circuit
- Dual Polarity Power Supply Circuit
- Dual Regulated Power Supply Circuit
- Dual Regulated Power Supply
- Dynamic Microphone Preamp
- ECM Mic Preamplifier
- Economical Pump Controller Circuit
- Economy radar detector Circuit
- Electromagnetic field detector Circuit
- Electromagnetic Field Probe with Meter Output Circuit
- Electromagnetic Field Probe with Meter Output
- Electronic Canary Circuit
- Electronic Combination Lock Circuit
- Electronic Doorbell with Counter
- Electronic Keypad
- Electronic Locker Circuit
- Electronic Night Light
- Electronics Attenuator Circuit
- Electronic Siren Circuit
- Electronic Stethoscope Circuit
- Electronic Stethoscope Circuit
- Emergency Light & Alarm Circuit
- EPROM adapter for ATMEL 89 Series Flash Microcontroller Programmer Ver 2.0 Circuit
- Everything-that-moves ALARM Circuit
- Fading LEDs Circuit
- Fancontrol Circuit
- Fast Electronic Fuse
- FET Audio Mixer Circuit
- Field-strength meter Circuit
- Field-strength meter Circuit
- Field Strength Meter
- Fixed Voltage Power Supply Circuit
- Flyback Transformer Driver Circuit
- FM radio (may be used with PC) Circuit
- FM Receiver
- FM Telephone Bug Circuit
- FM Transmitter Circuit
- FM Transmitter
- FM Transmitter Bug Circuit
- FM Transmitter Circuit
- FM Transmitter from David Sayles
- Fridge door Alarm Circuit
- Frost Alarm Circuit
- Frost Alarm
- Funcard Programmer by Diesel Circuit
- Function Generator Circuit
- Function Generator
- Fuse Blown Indicator
- Fuse Monitor / Alarm Circuit
- Geomagnetic field detector Circuit
- Gold wafer cards Circuit
- Guitar Amplifier Circuit
- Headlight Flasher Circuit
- Headlights Timer Circuit
- Headphone Amplifier Circuit
- Headphone Amplifier
- Heating System Thermostat Circuit
- Hi-Fi Preamplifier
- High And Low Voltage Cut Off With Time Delay Circuit
- High Current Power Supply Circuit
- High Voltage Stun Gun Circuit
- Hot Water Level Indicator
- iButton electronic lock Circuit
- Increasing Regulator Current
- Infa-Red Remote Control Circuit
- Infrared Detector Circuit
- Infrared gate 2 Circuit
- Infra-red Level Detector Circuit
- Infrared Remote Control Circuit
- Infra Red Remote Control Extender Circuit
- Infra Red Switch Circuit
- Infra Red Switch
- Infra Red TV Remote Control Extender
- Insect Repellant
- Instrument panel lamp dimmer control Circuit
- Intercommunication (Intercom) Circuit
- Inverter Circuit
- IR Link
- IR Link
- IR Remote Control Extender Circuit Circuit
- IR Remote Control Jammer Circuit
- IR Remote Control Modulation Detector
- IR Remote Control Tester Circuit
- IR Remote Control Tester Circuit
- IR Remote Control Tester
- Jogging Timer Circuit
- Keys Finder Circuit
- Knightrider lights for model cars Circuit
- L200 Power Supply
- Laser Communication System
- LASER Transmitter/Receiver Circuit
- Latching Continuity Tester Circuit
- LED Chaser Circuit
- Led display digital Voltmeter Circuit
- LED Flasher
- LED flasher 2
- LED or Lamp Flasher Circuit
- LED or Lamp Pulser Circuit
- LEDs or Lamps Sequencer Circuit
- LED Torch
- LED Torch
- Light/Dark Detector Circuit
- Light Detector Circuit
- Lightning Detector Circuit
- Light Sensitive alarm
- Light switch Circuit
- Linear FM 30Watt Circuit
- Linear FM 50Watt with BLY90 Circuit
- Linear Resistance Meter Circuit
- Live-line Detector Circuit
- LM317 Regulator Circuit
- LM317 VARIABLE POWER SUPPLY Circuit
- Logic Probe Circuit
- Logic Probe
- Logic PSU with Overvoltage Protection
- Low-distortion Audio-range Oscillator Circuit
- Low-Frequency Crystal Controlled Oscillator
- Low impedance microphone amplifier Circuit
- Low pass filter - Subwoofer Circuit
- Low Voltage Alarm Circuit
- Low Voltage Preamplifier
- Magic Wand Conjuring Trick
- Magnetic Gun Circuit
- Magnetic Gun
- Magnetic proximity sensors Circuit
- Magnetic-Radiation Remote-Control Circuit
- Mains Remote-Alert Circuit
- Medium range transmitter Circuit
- Medium Wave Active Antenna
- Metal Detector Circuit
- Metal Detector
- MILLIGAUSS METER. Circuit
- MILLIGAUSS METER
- Mini-box 2W Amplifier Circuit
- Mini efficient coil launcher from disposable camera flash Circuit
- Mini Metronome Circuit
- Model rocket launch controller
- Monitor Splitter
- Mosfet TESTER Circuit
- Motorola Hi-Fi power amplifier Circuit
- Multi Rocket Launcher Circuit
- Multi Rocket Launcher
- Multi Wire Cable Tester Circuit
- Multi Wire Cable Tester
- Muscular Bio-Stimulator Circuit
- NE555 Basic Monostable Circuit
- NE555 Basic Monostable
- Neon Desklamp
- Nicad Battery Charger Circuit
- Nicad Battery Charger
- Ni -Cd Batteries Charger Circuit
- Nite Rider Lights Circuit
- Nocturnal Animals Whisker Circuit
- Nostalgic Crystal Radio Circuit
- One-IC two-tones Siren Circuit
- On-Off Temperature Control Circuit
- Op-Amp Microphone Preamp
- Oscilloscope testing module (huntron circuit) Circuit
- Overvoltage Protection for the LM317
- Park Aid Circuit
- PBS Switch Debouncing Circuit
- PC Output Interface
- Peak Reading Audio Level Meter
- Periodic Timer Circuit
- Periodic Timer
- Phoenix Programmer Circuit
- Phone Busy Indicator Circuit
- Phone "Hold" With Music Circuit
- Phone Hold With Music
- Phone line indicator
- Phono Preamplifier Circuit
- Photo Timer Circuit Circuit
- PIC16F84A discolight effect with bass beat control Circuit
- PIC diode tester Circuit
- Picoammeter circuit with 4 ranges Circuit
- Plant Moisture Meter Circuit
- Plants Watering Watcher Circuit
- PlayPIC Circuit
- Ponyprog Circuit for ATMEL'S AVR Circuit
- Ponyprog Circuit for AVR & PIC16F84 Circuit
- Portable Headphone Amplifier Circuit
- Portable Microphone Preamplifier Circuit
- Portable Mixer Circuit
- Pot Plant Power
- Precision Audio Millivoltmeter Circuit
- Precision Metronome and Pitch generator Circuit
- Precision Receiver Battery Low Voltage Alarm Circuit
- Producing your own Decrypt Viewing Card Mk2 Circuit
- Pulse Charger for reviving tired Lead Acid batteries Circuit
- Pulse-Generator & Signal-Tracer Circuit
- Pulse Width Modulation DC Motor Control Circuit
- Pulsing Third Brake Light Circuit
- PWM Motor/Light Controller Circuit
- Q- Multiplying Loop Antenna
- Quadraphonic Amplifier
- Quiz Circuit
- R5000 Computer Interface
- Radio Remote Control using DTMF Circuit
- Rain Detector Circuit
- Receiver Battery Low Voltage Alarm Circuit
- Rectification using a Gyrator Circuit
- Regulated 12 Volt Supply Circuit
- Regulated 12 Volt Supply
- Remote Doorbell Warning Switch Circuit
- Remote Doorbell Warning Switch
- Repeating Interval Timer Circuit
- Repeating Interval Timer
- Repeating Timer No.2
- Reverse Bias Oscillator Circuit
- Ringing Phone Light Flasher Circuit
- Room Monitor
- Room Noise Detector Circuit
- Salt Taster Circuit
- Seismic detector Circuit
- Self-powered Fast Battery-Tester Circuit
- Self-powered Sine to Square wave Converter Circuit
- Sensitive DX TRF Receiver
- Short Wave Regenerative Reciver
- Signal Tracer and Injector
- Simple but reliable car battery tester Circuit
- Simple DC motor PWN speed control Circuit
- Simple Digital Volume Control Circuit
- Simple Field Strength Meter
- Simple Lie Detector Circuit
- "SimpleMouse" Smartcardprogrammer Circuit
- Simple optical switch Circuit
- Simple Servo Tester Circuit
- Sine Wave Generator
- Sleeping-Aid Circuit
- Small Radio Transmitter Circuit
- Small Variable Power Supply
- Soft Musical Telephone Ringer Circuit
- Soft Musical Telephone Ringer
- Soft Start PSU
- Solid State Power Controller Circuit
- Solid State Tesla Coil/High Voltage Generator Circuit
- Sound Effects Generator Circuit
- Sound Effects Generator 2 Circuit
- Sound Level Indicator Circuit
- Sound Level Meter Circuit
- Sound Operated Switch Circuit
- Sound Operated Switch
- Speaker Box Audio Amp Circuit
- Speaker Microphone Circuit
- Speed-limit Alert Circuit
- Sqaure Wave Oscillator
- Static Electricity Negative Ion Detector
- Stepper Motor Controller Circuit
- Stereo Preamplifier with Bass-boost Circuit
- Stereo Tube Amplifier Circuit
- Strobe Light Circuit
- Stun Gun Circuit
- Sun-Up Alarm
- Supply Voltage Indicator
- Surveillance Transmitter Detector
- S-video to RCA Circuit
- SW Receiver Using MK414
- SW RF Pre-Amplifier
- Tan Timer Circuit
- Telephone amplifier Circuit
- Telephone amplifier
- Telephone Hold Button Circuit
- Telephone In Use Indicator Circuit
- Telephone In-Use Indicator
- Telephone line monitor Circuit
- Telephone line monitor Circuit
- Telephone line monitor
- Telephone Record Control Circuit
- Temperature-controlled Fan Circuit
- Temperature Monitor
- The ATL-3 Loop Antenna
- The flashing Heart Circuit
- The GEM Class-A-AB Amplifier
- The Link 4+0 - Internal Intercom Circuit
- The Link A2B+1 (the Link Telephone Intercom - DTMF version) Circuit
- The Link "P" - Privacy Link! (Telephone Intercom) Circuit
- The Link Telephone Intercom - Every Home Should Have One! Circuit
- The Millipede Circuit
- The Original 2 Phone Link Design Circuit
- The Output Adjustable Flyback Converter
- The "UnFETtered Crystal Radio! Circuit
- Three-Level Audio Power Indicator Circuit
- Timed Beeper Circuit
- Time Delay Relay Circuit
- Time Delay Relay II Circuit
- Tone Control Circuit
- Touch Switch Circuit
- Touch Switch Circuit
- Touch Switch II Circuit
- Transformerless Power Supply Circuit
- Transformerless Power Supply
- Transistor Tester Circuit
- Transmitter FM 45W with valve Circuit
- Triac Based Light Controller
- TRIAC Light Dimmer Circuit
- Triangle / Squarewave Generator Circuit
- Triple Stroboscope Circuit
- TTL Power Supply with 'Crowbar' protection Circuit
- TV Transmitter
- Two Simple Crystal Test Circuits
- Two-wire Lamp Flasher Circuit
- UHF Preamplifier
- Ultra-simple Voltage Probe Circuit
- Ultrasonic Dog Whistle
- UltraSonic Radar Circuit
- Unipolar Stepper Motor Controller Circuit
- Universal DC-DC Convertor
- Universal PSU
- Unregulated Power Supply
- Variable DC Power Supply Circuit
- Variable Power Supply
- Variable Power Supply Using Fixed Regulator
- Variable Voltage Regulation
- Vinyl Pre-Amplifier
- Voice activated switch Circuit
- Voice-Over Circuit
- Voltage Comparator Switch
- Voltage follower with 1G ohm input resistance Circuit
- Voltage Inverter II Circuit
- Voltage Monitor Circuit
- Wart Zapper
- Water Activated Relay
- Whistle Responder Circuit
- XTal Tester Circuit
- Zener Diode Tester
- ZN414 Portable AM Receiver Circuit
- ZN414 Portable Receiver