Electronic Circuits

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Here are some neat circuits you might want to try. The schematics and printed circuit board patterns are GIF's, and may show up different on some browsers. You might want to save the images (especially the PC board patterns) to your hard drive, load them into a photo editor (Photoshop, Paint Shop Pro, The GIMP, etc.) and adjust the size before you transfer the pattern to a board. Printed circuit board patterns are available possible. This page is always under construction and there will be new additions from time to time. Some of these circuits were designed by me, most are not. Whenever possible I have tried to credit the author of a circuit but since many of these circuits are from my personal collection that I have gathered over a period of many years, this information is not always available.

You can rank circuits according to how much you like a circuit by clicking on the lightning bolt icons. These ranks can be based on how much you like a circuit, whether a circuit worked or didn't work for you, or how useful you found a circuit. Additionally you can add your own comments at the bottom of each circuit by filling out the form.

Circuit Catagories

Circuits are divided into categories as listed below.

Catagory Circuits
Auto 3
Computer 2
Light/Laser 21
Major Projects 2
Other 21
Power Supply 18
Sound/Radio 22
Telephone 8

Some circuits in this list have little astrisk (*) markers beside them which give a basic amount of information regarding whether the circuit has been designed, tested or modified by the webmaster.

Marker Description
* The circuit has not been tested by me. Therefore, I will offer no gaurantee that they will work.
* This circuit has been designed by me.
* This circuit was not designed by me, but was modified by me.

Most Popular Circuits

The most popular circuits of today, yesterday and all time can be found below.

When Circuit Views
Today
Thursday, February 12, 2026		 Solid State Tesla Coil/High Voltage Generator15
Aircraft Radio Communications Receiver14
Yesterday
Wednesday, February 11, 2026		 12VDC To 120VAC Inverter42
Automatic 12V Lead Acid Battery Charger33
Of All Time 12VDC To 120VAC Inverter1,560,187
FM Transmitter1,031,369

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,009 61 *
Car Alarm Arming Horn Beep Canceller bob 144,699 6 *
Wireless Auto Tachometer 353,332 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,734 29 *
Parallel (Printer) Port Interface 299,087 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,303 63 *
3 Channel Spectrum Analyzer 233,334 20
40W Fluorescent Lamp Inverter Bart Milnes 339,858 60 *
Adjustable Strobe Light 320,561 36
Black Light 295,259 29
Colour (Sound) Organ 302,595 36
Electronic Dice NEW! 199,165 10 *
Fantastic Atom Expander 211,533 25
Flash Slave Trigger 231,654 18 *
Infa-Red Remote Control 650,287 216 *
IR Remote Extender NEW! 142,692 3 *
IR Remote Jammer Carl 277,495 110 *
IR Remote Switch NEW! 167,009 9 *
LASER Transmitter/Receiver 429,662 92
LED Chaser 459,233 83 *
LED Metronome NEW! 108,735 3 *
LED Thermometer 215,703 22 *
Light/Dark Detector 315,165 90 *
Simple Colour Organ 146,093 11 *
Strobe Light 285,073 27 *
TRIAC Light Dimmer 565,718 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,621 122 *
Electromagnetic Levitator NEW! 153,468 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,482 214 *
AC Motor Speed Controller 406,670 29 *
Air Flow Detector 261,356 54 *
Digital Keypad Combination Lock 211,181 20
Low Voltage Alarm 239,277 58 *
Pine Racecar Victory Judge 110,921 1 *
Pulse Width Modulation DC Motor Control 668,033 94
Rain Detector 315,104 112 *
Simple Lie Detector 577,384 323
Simple Polarity Tester Dudley LeRoux 175,219 13 *
Simple Servo Controller 232,030 22 *
Simple Touch Switch NEW! 180,211 6 *
Simple Two Speed Contactor DC Motor Controller 215,431 21 *
Stepper Motor Controller 766,758 120 *
Time Delay Relay 567,527 88
Time Delay Relay II jawaharlal@excite.com 257,740 39 *
Touch Switch 300,406 51 *
Video Activated Relay 130,538 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,491 10 *
Water Detector With Sump/Bilge Pump Controller 162,513 18 *
Wire Loop Alarm Alex Meaden 214,761 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,051 25 *
12VDC To 120VAC Inverter 1,560,187 691
6V to 12V Converter 541,616 121
Automatic 12V Lead Acid Battery Charger 951,970 248
Automatic Load Sensing Power Switch 177,471 16 *
Car Battery Charger 896,844 159 *
Dual Polarity Power Supply 383,607 84 *
Fixed Voltage Power Supply 322,042 52 *
High Current Power Supply 353,601 66 *
High Voltage High Current Power Supply 275,000 35 *
LASER Power Supply 307,640 28
Portable CD Player Adapter For Car 222,139 12 *
Power Supply 752,202 259 *
Solid State Tesla Coil NEW! 158,977 4
Solid State Tesla Coil/High Voltage Generator 459,591 51
Transformerless Power Supply 475,119 117 *
Voltage Inverter 355,601 51 *
Voltage Inverter II 214,087 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,105 182
3 Watt FM Transmitter Rae XL Tkacik 351,023 83 *
50 Watt Amplifier 521,557 74
8 Note Tune Player 149,945 12 *
8 Watt Audio Amp 387,892 67 *
Aircraft Radio Communications Receiver 292,515 50 *
Crystal Radio 171,538 53 *
Digital Volume Control 351,128 47 *
Electronic Stethoscope 334,067 142 *
FET Audio Mixer 355,091 41
FM Transmitter 1,031,369 420
Guitar Fuzz Effect 260,438 54 *
Microphone Mixer Anatoly I. Shikhatov 261,531 26 *
Mono To Stereo Synthesizer oRbEq 145,232 18 *
One Tube Regenerative Radio NEW! 162,222 4 *
Op Amp Radio 403,658 80 *
Single Chip AM Radio NEW! 109,872 4 *
Single Chip FM Radio NEW! 185,174 1 *
Sound Level Meter 353,499 51 *
Stereo Tube Amplifier Weslee Kinsler 280,298 15 *
Tone Control 321,913 31
Transistor Organ 211,256 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,246 27 *
FM Telephone Bug 243,689 57
Phone Busy Indicator 223,094 24 *
Remote Telephone Ringer 126,737 3 *
Ringing Phone Light Flasher 230,420 35 *
Simple Phone Tap Derek Tombrello 393,244 98 *
Telephone Hold Button 137,780 10
Telephone Recorder 225,652 55 *

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All material marked as mine is property of Aaron Cake. You may, however, distribute it as much as you want, with or without credit to me. Just don't claim credit for it yourself, and it would be nice if you included a link back to my page. All other material is property of its authors.