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
Tuesday, October 21, 2025		 12VDC To 120VAC Inverter36
12V To 24V DC-DC Converter34
Yesterday
Monday, October 20, 2025		 12VDC To 120VAC Inverter44
FM Transmitter40
Of All Time 12VDC To 120VAC Inverter1,554,640
FM Transmitter1,027,033

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,177 61 *
Car Alarm Arming Horn Beep Canceller bob 142,913 6 *
Wireless Auto Tachometer 351,139 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,250 29 *
Parallel (Printer) Port Interface 296,629 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,956 63 *
3 Channel Spectrum Analyzer 231,162 20
40W Fluorescent Lamp Inverter Bart Milnes 337,785 60 *
Adjustable Strobe Light 318,461 36
Black Light 292,515 29
Colour (Sound) Organ 300,168 36
Electronic Dice NEW! 197,063 10 *
Fantastic Atom Expander 209,716 25
Flash Slave Trigger 229,519 18 *
Infa-Red Remote Control 647,791 216 *
IR Remote Extender NEW! 140,611 3 *
IR Remote Jammer Carl 275,308 110 *
IR Remote Switch NEW! 164,965 9 *
LASER Transmitter/Receiver 427,246 92
LED Chaser 456,635 83 *
LED Metronome NEW! 106,774 3 *
LED Thermometer 213,991 22 *
Light/Dark Detector 313,340 90 *
Simple Colour Organ 144,298 11 *
Strobe Light 283,223 27 *
TRIAC Light Dimmer 563,180 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,367 122 *
Electromagnetic Levitator NEW! 151,639 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,839 214 *
AC Motor Speed Controller 403,845 29 *
Air Flow Detector 259,407 54 *
Digital Keypad Combination Lock 209,226 20
Low Voltage Alarm 237,134 58 *
Pine Racecar Victory Judge 109,203 1 *
Pulse Width Modulation DC Motor Control 665,445 94
Rain Detector 312,965 112 *
Simple Lie Detector 574,846 323
Simple Polarity Tester Dudley LeRoux 172,932 13 *
Simple Servo Controller 229,933 22 *
Simple Touch Switch NEW! 178,016 6 *
Simple Two Speed Contactor DC Motor Controller 213,351 21 *
Stepper Motor Controller 763,347 120 *
Time Delay Relay 565,281 88
Time Delay Relay II jawaharlal@excite.com 255,545 39 *
Touch Switch 298,318 51 *
Video Activated Relay 128,781 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,827 10 *
Water Detector With Sump/Bilge Pump Controller 160,313 18 *
Wire Loop Alarm Alex Meaden 213,025 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,433 25 *
12VDC To 120VAC Inverter 1,554,640 691
6V to 12V Converter 538,925 121
Automatic 12V Lead Acid Battery Charger 948,914 248
Automatic Load Sensing Power Switch 175,445 16 *
Car Battery Charger 894,188 159 *
Dual Polarity Power Supply 380,899 84 *
Fixed Voltage Power Supply 320,063 52 *
High Current Power Supply 350,840 66 *
High Voltage High Current Power Supply 272,741 35 *
LASER Power Supply 305,525 28
Portable CD Player Adapter For Car 220,000 12 *
Power Supply 749,760 259 *
Solid State Tesla Coil NEW! 156,226 4
Solid State Tesla Coil/High Voltage Generator 456,558 51
Transformerless Power Supply 472,658 117 *
Voltage Inverter 352,596 51 *
Voltage Inverter II 211,954 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,848 182
3 Watt FM Transmitter Rae XL Tkacik 348,206 83 *
50 Watt Amplifier 519,096 74
8 Note Tune Player 148,042 12 *
8 Watt Audio Amp 385,173 67 *
Aircraft Radio Communications Receiver 290,010 50 *
Crystal Radio 168,788 53 *
Digital Volume Control 348,641 47 *
Electronic Stethoscope 331,746 142 *
FET Audio Mixer 353,042 41
FM Transmitter 1,027,033 420
Guitar Fuzz Effect 257,690 54 *
Microphone Mixer Anatoly I. Shikhatov 259,469 26 *
Mono To Stereo Synthesizer oRbEq 143,002 18 *
One Tube Regenerative Radio NEW! 158,841 4 *
Op Amp Radio 401,191 80 *
Single Chip AM Radio NEW! 107,814 4 *
Single Chip FM Radio NEW! 182,610 1 *
Sound Level Meter 351,272 51 *
Stereo Tube Amplifier Weslee Kinsler 277,606 15 *
Tone Control 319,446 31
Transistor Organ 209,067 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,540 27 *
FM Telephone Bug 242,154 57
Phone Busy Indicator 221,349 24 *
Remote Telephone Ringer 124,963 3 *
Ringing Phone Light Flasher 228,118 35 *
Simple Phone Tap Derek Tombrello 391,446 98 *
Telephone Hold Button 136,217 10
Telephone Recorder 224,049 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.