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Alarms, control, timers
- Voltage Controlled Switch using 555 Timer
- Dark Activated Switch
- Hot Water Level Indicator
- Infra Red Switch
- Proximity sensor
- Car Alarm and Immobilizer
- 5 to 30 Minute Timer
- Garage - Shed Alarm
- Electronic Keypad
- Frost Alarm
- Periodic Timer
- 5 Zone Alarm System
- Single Zone CMOS Alarm
- DC Motor Reversing
- On-Off Temperature Control
- Multi Rocket Launcher
- AC Current Monitor
- PWM Motor-Light Controller
- Unipolar Stepper Motor Controller
- Fancontrol
- DC Motor Control Circuit
- On-Off Temperature Control
- DC Motor Reversing Circuit
- Dark-activated LED or Lamp Flasher
- Temperature-controlled Fan
- Infa-Red Remote Control
- Pulse Width Modulation DC Motor Control
- Stepper Motor Controller
- Simple DC motor PWM speed control
- Auto Heat Limiter for Soldering Iron
- High current bipolar stepper motor controller
- DC servo motor driver
- Dark Sensitive Switch
- Automatic Fan Controller
- Time Delay Relay
- Time Delay Relay II
- Simple optical switch
- IR Remote Volume Controller
- Solid state relay switch
- Dual Relay Driver Board
- 4 channel infrared remote relays
- Precision Metronome and Pitch generator
- Bedside Lamp Timer
- Timed Beeper
- Mini Metronome
- Jogging Timer
- Tan Timer
- Photo Timer Circuit
- Plants Watering Watcher
- Rain Detector
- The Relay Sub Board
- Stepper motor controller
- 8 Channel software controlled fanbus with PWM
- Sound Controlled Filp Flop
- Ultrasonic Switch
- Control electrical appliances using PC
- 7 segment rolling display using PC
- Remote control using telephone
- Dew sensor
- Optical toggle switch using a single Chip
- Light Barrier Detector
- Theft preventer alarm
- Rain Alarm
- Water Level Indicator with alarm
- 4 in 1 Burglar Alarm
- Fire Alarm
- DayLight Alarm
- Infrared beam barrier
- Timed Burglar Alarm
- Remote control using VHF modules
- Clap Activated Remote
- Radio Remote Control using DTMF
- Touch Activated Light
- Astable Multivibrator
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Audio
- Mini-box 2W Amplifier
- 2N3055 Power Amplifier 60W
- Digital Volume Control
- 8 Watt Audio Amp
- Speaker Microphone Circuit
- 22 Watt Audio Amplifier
- 15 Watt Amplifier
- ECM Mic Preamplifier
- Dynamic Microphone Preamp
- Headphone Amplifier
- Op-Amp Microphone Preamp
- Class-A-AB Amplifier 100w
- 6 Input Mixer
- Audio Line Driver
- Audio Notch Meter
- Peak Reading Audio Level Meter
- Quadraphonic Amplifier
- Laser Communication System
- Audio Perimeter Monitor
- 25W Mosfet audio amplifier
- 50 Watt Amplifier
- Low impedance microphone amplifier
- 3 Line Mixer
- Electronics Attenuator
- 18W Audio Amplifier
- 10W Mini Audio Amplifier
- Portable Headphone Amplifier
- Precision Audio Millivoltmeter
- Phono Preamplifier
- Amplified Ear
- Portable Microphone Preamplifier
- Portable Mixer
- Stereo Preamplifier with Bass-boost
- 10W Audio Amplifier with Bass-boost
- Automatic Loudness Control
- Three-Level Audio Power Indicator
- Guitar Amplifier
- 60W Guitar Amplifier
- FET Audio Mixer
- Sound Level Meter
- Stereo Tube Amplifier
- 3 Channel Spectrum Analyzer
- Amplifier of acoustic frequencies and preamplifier
- Bass-treble tone control circuit
- Speaker Box Audio Amp
- Motorola Hi-Fi power amplifier
- Tiny audio amplifier using LM386
- Stereo tape head preamplifier using LA3161
- 20W Bridge Audio Amplifier
- 20W Audio Amplifier using LM1875
- Three Channel Audio Mixer
- Infrared cordless Headphone Amplifier
- 200W Audio Amplifier
- 5-Band Graphic Equalizer
- Portable Audio Amplifiers
- Universal Preamplifier
- Cheap Audio Booster
- 60W Linear amplifier
- Intercommunication-Intercom
- Audio VU meter 9 leds
- Amplifier Timer
- Stereo Channel Selector
- Low cost intercom using transistors
- Infrared Head Phones
- Use the CD-ROM drive as a audio CD player
- Digital Volume Control
- Audio level meter
- A simple electronic buzzer
- Melody generator for greeting cards
- Big Ben Sound
- Beeper
- 3 Transistor Audio Amp
- Improved 3 Transistor Audio Amp
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Tools and measuring
- Metal Detector
- Digital Radar Speedometer
- Function Generator
- Electromagnetic Field Detector
- IR Remote Control Modulation Detector
- Beat Balance Metal Detector
- Signal Tracer and Injector
- Bench Amplifier
- MILLIGAUSS METER
- Sine Wave Generator
- Connection Tester
- Coil Coupled Operation Metal Detector
- Static Electricity - Negative Ion Detector
- Speech Recorder
- Self-powered Fast Battery-Tester
- Simple Servo Tester
- 555 stepper pulse generator
- Digital Step-Km Counter
- Cellular Phone calling Detector
- Simple Lie Detector
- Continuity Tester
- IR Remote Control Tester
- Linear Resistance Meter
- XTal Tester
- Capacitance Meter
- Digital Voltmeter
- Transistor Tester
- Triangle-Squarewave Generator
- Picoammeter circuit with 4 ranges
- Beeper to find short circuits
- Mosfet TESTER
- Crystal Tester
- Oscilloscope testing module
- Voltage Monitor
- Logic Probe
- Digital Radar Speedometer
- Simple but reliable car battery tester
- 1KHz Sinewave Generator
- Self-powered Sine to Square wave Converter
- Low-distortion Audio-range Oscillator
- Pulse-Generator and Signal-Tracer
- Adjustable High-Low Frequency Sine wave generator
- Electromagnetic field detector
- Lightning Detector
- Field-strength meter
- Salt Taster
- Air Flow Detector
- Electronic Stethoscope
- 4 - Channel Digital Logic Analyzer
- 3 Channel Spectrum Analyzer
- PC based Frequency Meter
- Off line Telephone tester
- A simple Remote control Tester
- Contactless Mains Voltage Indicator
- Zener Diode Tester
- Magnetic proximity sensors
- Color Sensor
- Simple IF Signal Generator
- Pot plant water tester
- Simple variable frequency oscillator
- Sawtooth wave generator
- A simple Remote control Tester
- Low Frequency Sinewave Generators
- Decibel Meter
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Power supplies
- Transformerless Power Supply
- 6V to 12V Converter
- Portable CD Player Adapter For Car
- Dual Polarity Power Supply
- High Current Power Supply
- 13 Volt 20 Amp PSU
- 12 Volt 30 Amp PSU
- Soft Start PSU
- Fast Electronic Fuse
- Variable Power Supply
- Rectification using a Gyrator Circuit
- Fuse Monitor - Alarm
- Ni -Cd Batteries Charger
- Basic UPS Power Supply
- Dual Regulated Power Supply
- Nicad Battery Charger
- Regulated 12 Volt Supply
- LM317 VARIABLE POWER SUPPLY
- Variable DC Power Supply
- Fixed Voltage Power Supply
- Inverter
- LASER Power Supply
- Voltage Inverter
- Voltage Inverter II
- 0-50V 2A Bench power supply
- Solar charger for lead-acid batteries
- 500W low cost 12V to 220V inverter
- TTL Power Supply with Crowbar protection
- Pulse Charger for reviving Lead Acid batteries
- NiCd - NiMH Charger
- Dual Voltage Power Supply
- Solid State Power Controller
- High And Low Voltage Cut Off With Time Delay
- 2500W Phase Control
- Flyback Transformer Driver
- Power supply failure alarm
- Charge Monitor for 12V lead acid battery
- Emergency Light
- Negative Supply from single positive Supply
- Self switching Power Supply
- Ultra low drop linear voltage regulator
- Over-Under Voltage Cut-Out
- High and Low Voltage Cutout with delay and Music
- High Voltage Low Current Supply
- Simple Car Battery Charger
- LM317T Variable Voltage Regulator
- LM317T Voltage Regulator with Pass Transistor
- Simple Adjustable Voltage Source
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Light and LED
- Adjustable Strobe Light
- 12VDC Fluorescent Lamp Driver
- 6 Channel Disco Running Lights
- Bicycle back Safety Light
- Neon Desklamp
- Instrument panel lamp dimmer control
- Black Light
- Adjustable Strobe Light
- LED or Lamp Flasher
- 220 Volts Flashing Lamps
- Two-wire Lamp Flasher
- Courtesy Light
- Battery-powered Night Lamp
- LED or Lamp Pulser
- Dancing LEDs
- Fading LEDs
- Brightness Control for small Lamps
- LEDs or Lamps Sequencer
- LED Chaser
- TRIAC Light Dimmer
- LASER Transmitter-Receiver
- Triple Stroboscope
- 200W Lamp Flasher
- 5 Lamp-LED Flash Driver
- Low cost-Automatic Emergency Light
- Nite Rider Lights
- 28 LED Clock Timer
- 230V Blinking LED
- 40W Fluorescent Lamp Inverter
- Colour-Sound-Organ
- Fantastic Atom Expander
- Audio Light Modulator
- Flashy Christmas Lights
- Brakelight Flasher
- Light Flasher
- Automatic Dual output Display
- Automatic Room Lights
- Christmas Star
- Alternating Flasher
- LED Photo Sensor
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Radio
- Powerful AM transmitter
- Op Amp Radio
- FM OpAMP Transmitter Circuit
- FM Transmitter from David Sayles
- TV Transmitter
- Medium Wave Active Antenna
- 2 Transistor FM Voice Transmitter
- FM Transmitter from David Sayles
- AM Receiver
- A bipolar regenerative receiver
- Field Strength Meter
- Simple Field Strength Meter
- 4 Transistor Transmitter
- 2 Transistor Transmitter
- 4 Band Double Tuned Preselector
- ZN414 Portable Receiver
- SW Receiver Using MK414
- UHF Preamplifier
- The ATL-3 Loop Antenna
- Surveillance Transmitter Detector
- 6 x 6 Loop Antenna
- 73 MHz Hallogene Lamp Radio-Controlled
- FM Transmitter Bug
- Small Radio Transmitter
- AM Transmitter
- Linear FM 50Watt with BLY90
- 3W FM Transmitter
- CB receiver
- CB transmitter
- Transmitter FM 45W with valve
- FM radio
- 4W FM Transmitter
- A small FM transmitter
- Medium range transmitter
- AM FM Simultaneous Transmitter Using Digital IC
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Telephone related
- FM Telephone Bug
- Ringing Phone Light Flasher
- Telephone line monitor
- Cellular Phone calling Detector
- Phone Hold With Music
- Soft Musical Telephone Ringer
- Telephone amplifier
- Cut Phone Line Detector
- Phone Busy Indicator
- Ringing Phone Light Flasher
- Telephone Hold Button
- 8 Line Intercommunication using 89c51
- Audio Visual Indicator for Telephones
- Telephone Ringer using 556 dual timers
- Two line intercom plus
- Telephone line based audio muting and light
- Having secrecy in parallel telephones
- Telephone call meter using calculator
- Phone Broadcaster
- Conversation Recorder
- Multipurpose Circuit for telephone
- Cordless phone backup
- Telephone Number Display
- Smart Phone light
- Telephone Headgear
- Telephone Line Vigilant
- Audio Visual Ringer
- Telephone Audio Interface
- Telephone In-Use Relay Controller
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Miscellaneous
- Whistle Responder
- Doorbell for the Deaf
- TV remote control Blocker
- High Voltage Stun Gun
- Sound Effects Generator
- High Quality Intercom
- Muscular Bio-Stimulator
- Insect Repellant
- Magic Wand Conjuring Trick
- Magnetic Gun
- Ultrasonic Dog Whistle
- IR Remote Control Jammer
- Keys Finder
- Whistle Responder
- Nocturnal Animals Whisker
- 7 Segment LED Counter
- Voltage follower with 1G ohm input resistance
- Muscular Bio-Stimulator
- Sleeping-Aid
- Ultrasonic pest repellent
- Electronic Scoring Game
- JAM-Just A Minute
- Factory Siren
- Programmable Digital Code Lock
- Running Message Display
- For your car
- PC related
Circuit categories
Alarms, control, timers
- Audio
- Tools and measuring
- Power supplies
- Light and LED
- Radio
- Telephone related
- Miscellaneous
- For your car
- PC related