at a glance

 

Audio 25W Mosfet audio amplifier Two way cross-over 3500 Hz Mini-box 2W amplifier 50W amplifier 100W rms amplifier 22W audio amplifier Low impedance microphone amplifier Low pass filter - subwoofer filter 3 Line mixer Digital volume control Electronics attenuator 18W audio amplifier 200W audio amplifier 2x30W (stereo) amplifier with STK465 Auto volume control 10W Mini Audio Amplifier 100 W Audio Amplifier Portable Headphone Amplifier Speech Recorder Precision Audio Millivoltmeter Phono Preamplifier Headphone Amplifier 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 60W Bass Amplifier Digital Volume Control FET Audio Mixer Sound Level Meter Stereo Tube Amplifier 3 Channel Spectrum Analyzer Amplifier of acoustic frequencies with preamplifier Bass-treble tone control circuit Speaker Box Audio Amp Motorola Hi-Fi power amplifier 2N3055 Power Amplifier 5,000W ultra-light, high-power amplifier, without switching-mode power supply Tiny audio amplifier using LM386 Stereo tape head preamplifier using LA3161 20W Bridge Audio Amplifier 20W Audio Amplifier using LM1875 Active Bass & Tremble Controller Three Channel Audio Mixer Infrared cordless Headphone Amplifier 200W Audio Amplifier 5-Band Graphic Equalizer 600W Audio Amplifier Portable Audio Amplifiers Universal Preamplifier Cheap Audio Booster   Automotive Car Battery Indicator Pulsing Third Brake Light Headlight Flasher Speed-limit Alert Park-Aid Automatic Headlight Brightness Switch Car Battery Charger Electronic car ignition Simple but reliable car battery tester Synchronized multi-spark module (SMSM) for Electronic Ignition Devices (EID) Nite Rider Lights Automotive 12V to +-20V converter (for audio amplifier)   Games and entertainment - Robots The Flashing Heart The Millipede 3V LED Chaser 6V Ultra-Bright LED Chaser High Power LED mood Lamp PIC16F84A discolight effect with bass beat control   Models and model remote control Deluxe Charge Rate Limiter for Small Capacity NiCad Batteries Infrared gate 2 Downed Model Locator Precision Receiver Battery Low Voltage Alarm Multi Rocket Launcher Discharger for Receiver Battery Packs Receiver Battery Low Voltage Alarm Infra Red Switch Infrared Remote Control Downed Model Locator II   Motor, light and power control Phorism with 12V Black Light PWM Motor/Light Controller Unipolar Stepper Motor Controller Adjustable Strobe Light Fan control DC Motor Control Circuit Simple Servo Tester Sound Level Indicator Low power blink led On-Off Temperature Control DC Motor Reversing Circuit Dome Lamp Dimmer LED or Lamp Flasher 220 Volts Flashing Lamps Bicycle back Safety Light Two-wire Lamp Flasher Courtesy Light Battery-powered Night Lamp LED or Lamp Pulser Dancing LEDs Fading LEDs Brightness Control for small Lamps Dark-activated LED or Lamp Flasher Temperature-controlled Fan LEDs or Lamps Sequencer 12VDC Fluorescent Lamp Driver LED Chaser (Knight Rider lights) TRIAC Light Dimmer Infa-Red Remote Control IR Remote Control Jammer LASER Transmitter/Receiver Pulse Width Modulation DC Motor Control Stepper Motor Controller Knightrider lights for model cars Triple Stroboscope 73 MHz Hallogene Lamp Radio-Controlled Simple DC motor PWM speed control 6 Channel Auto Reverse Sequential Disco Running Lights Auto Heat Limiter for Soldering Iron Solid State Power Controller High And Low Voltage Cut Off With Time Delay Light Control System IR Light Dimmer v.1 High current bipolar stepper motor controller DC servo motor driver 200W Lamp Flasher 555 stepper pulse generator Dark Sensitive Switch 5 Lamp / LED Flash Driver Low cost / Automatic Emergency Light Automatic Fan Controller   Oscillators and timers Reverse Bias Oscillator 1KHz Sinewave Generator Self-powered Sine to Square wave Converter Amplifier Timer Low-distortion Audio-range Oscillator Precision Metronome and Pitch generator Bedside Lamp Timer Timed Beeper Mini Metronome Jogging Timer Tan Timer Pulse-Generator & Signal-Tracer Headlights Timer Digital Stopwatch 0-99sec Digital Stopwatch 0-60sec Adjustable High/Low Frequency Sine wave generator 28 LED Clock Timer Photo Timer Circuit Darkroom Timer v2.0A for PCB Exposure Box 230V Blinking LED Pulse generator   PC related RS-232 Laser Transceiver Casio data logger The Relay Sub Board The 8Way Relay Board A Worked Stepping Motor Example 4 Ch Digital Logic Analyzer and 5 Ch Digital Oscilloscope in Parallel Port 3-Axis Stepper Controller Opto-Isolated Stepper Motor Controller DS1621 pc thermometer Serial Cable for Casio Digital Cameras LCD to LPT with Lirc VGA to TV Scart Simple PC thermometer DS1620 based USB Digital Thermometer The Simplified I/O Interface PC Thermometer V2 Stepper motor controller IrDA interface for your mainboard Improved Infrared Receiver with status led Build your own printer cable LCD Display 8 Channel software controlled fanbus with PWM An Improved Infrared Receiver with status led (Billy's Plug) RJ45 Network card to IR communication A Laboratory Control System for Cold Atom Experiments 8 Channel LPT relay board USB Sound Card with PCM2702 Ethernet Controller   MCU (Microcontrollers) PlayPIC Smart card programmer Producing your own Decrypt Viewing Card Mk2 Phoenix Programmer Gold wafer cards Funcard Programmer Programmers for Jupiter Card Ponyprog Circuit for AVR & PIC16F84 Ponyprog Circuit for ATMEL'S AVR ATMEL 89 Series Flash Microcontroller Programmer EPROM adapter for ATMEL 89 Programmer PIC diode tester Nokia 3310 Lcd Thermometer using DS18B20 ATmega48/88/168 Development Board AquaCont - Aquarium Control Digital Volt and Amp Meter with Temperature Control   RF Circuits 4W FM Transmitter FM Transmitter Bug TV Signal amplifier Small Radio Transmitter Electronic Eavesdropping Devices Detector AM Receiver Radio Shack Special ZN414 Portable AM Receiver 20dB VHF Amplifier Linear FM 30Watt AM Transmitter 2 Transistor FM Voice Transmitter Linear FM 50Watt with BLY90 15W Fm-transmitter Video signal amplifier 3W FM Transmitter CB receiver CB transmitter Transmitter FM 45W with valve FM radio 4W FM Transmitter Active FM antena A small FM transmitter (SMD) Nostalgic Crystal Radio Medium range transmitter AM to FM converter 60W Linear amplifier AM FM Simultaneous Transmitter Using Digital IC The "UnFETtered Crystal Radio! Simple FM Transmitter   Power Ni -Cd Batteries Charger Basic UPS Power Supply 0-30 Vdc Stabilized Power Supply With Current Control 0.002-3 A Auto batteries charger (Pd) +/- 15V Dual Regulated Power Supply Fuse Monitor / Alarm Nicad Battery Charger Regulated 12V 500mA power supply 12 Volt 30 Amp PSU LM317 Variable power supply 1,2 - 25V 1.5A Variable DC Power Supply 0,7-24V 50mA - 2A Self-powered Fast Battery-Tester AC Current Monitor 6V to 12V Converter Dual Polarity Power Supply Fixed Voltage Power Supply High Current Power Supply Inverter LASER Power Supply Portable CD Player Adapter For Car Solid State Tesla Coil/High Voltage Generator Transformerless Power Supply Voltage Inverter Voltage Inverter II 5V/1A Power Supply Instrument panel lamp dimmer control 13.8V 10A power supply 13.8V 20A power supply 0-50V 2A Bench power supply A simple step-up converter (6V to 12V) Solar charger for lead-acid batteries. 3-30 V/2.5 A Stabilized power supply 500W low cost 12V to 220V inverter TTL Power Supply with ‘Crowbar’ protection Batteries charger & PSU - ideal for digital cameras Pulse Charger for reviving tired Lead Acid batteries NiCd - NiMH Charger 1.2 - 15V/3A adjustable regulated power supply Dual Voltage Power Supply   Robotics - GPS 12-way Input/Output Interface Church bell Controller Open GPS Tracker   Security and other sensors and detectors Light switch Touch switch IR Remote Control Extender Circuit Frost Alarm Sound Operated Switch Remote Doorbell Warning Switch UltraSonic Radar Infra Red Remote Control Extender IR transceiver 1.0 Digital Remote Thermometer Fridge door Alarm Room Noise Detector Capacitive Sensor Ultra-simple Voltage Probe Live-line Detector Infra-red Level Detector Emergency Light & Alarm Heating System Thermostat Field-strength meter Door Alarm Mains Remote-Alert Light/Dark Detector Low Voltage Alarm Touch Switch II Voice activated switch Metal Detector Economical Pump Controller iButton electronic lock Electronic Locker Everything-that-moves ALARM KeyLock Led Sensor Water level buzzer Ethernet based Security System   Science related Lightning Detector Geomagnetic field detector Infrared Detector Seismic detector Magnetic Gun Electromagnetic field detector Field-strength meter 1 Plants Watering Watcher Muscular Bio-Stimulator Sleeping-Aid Magnetic-Radiation Remote-Control Salt Taster Air Flow Detector Electronic Stethoscope Rain Detector High Voltage Stun Gun Mini efficient coil launcher from disposable camera flash Plants Watering Watcher 2 Electronic Stethoscope 2   Telephone related Phone line indicator Phone "Hold" With Music Soft Musical Telephone Ringer Telephone amplifier Telephone line monitor Cut Phone Line Detector FM Telephone Bug Phone Busy Indicator Ringing Phone Light Flasher Simple Phone Tap Telephone Hold Button Telephone line monitor The Link Telephone Intercom The Link A2B+1 (the Link Telephone Intercom - DTMF version) The Link 4+0 – Internal Intercom The Original 2 Phone Link Design 8 Line Intercommunication using 89c51 The Link "P" - Privacy Link! (Telephone Intercom) Two way Simple Very Small Telephone Exchange   Test and measurement Continuity Tester Latching Continuity Tester IR Remote Control Tester Linear Resistance Meter XTal Tester Capacitance Meter Digital Voltmeter Transistor Tester Function Generator Triangle / Square wave Generator Picoammeter circuit with 4 ranges Beeper to find short circuits Voltage follower with 1G ohm input resistance Led display digital Voltmeter Mosfet TESTER Inductance meter adapter Crystal Tester Oscilloscope testing module (huntron circuit) Voltage Monitor Logic Probe Digital Radar Speedometer Voltmeter + Ammeter LCD panel IR Digital Thermostat for FAN   Miscellaneous InterCommunication Keys Finder SmartCard PC Emulator Economy radar detector S-video to RCA One-IC two-tones Siren Digital Step-Km Counter Whistle Responder Nocturnal Animals Whisker Cellular Phone calling Detector Cuckoo sound Generator 7 Segment LED Counter Simple Lie Detector Time Delay Relay Time Delay Relay II Flyback Transformer Driver Simple optical switch IrOn-Off Unusual clock with AT89C2051 Audio VU meter 9 leds IR Remote Volume Controller Solid state relay switch Dual Relay Driver Board 4 channel infrared remote relays The experimenter’s pot - Digital Potentiometer MAX6953 Development board   Tube Circuits Direct Coupled 15 Watt Amp Dynakit Mark III 60 Watt Power Amplifier Stereo Tube Amp Nixie Clock 25 Watt Music Amplifier Push - Pull 24 Watt A Class Amplifier 500w 4X150A/7034 Tube 26-30MHz VHF output amplifier Tube 829 RF power amplifier