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, October 16, 2025		 12VDC To 120VAC Inverter23
12V To 24V DC-DC Converter18
Yesterday
Wednesday, October 15, 2025		 12VDC To 120VAC Inverter49
FM Transmitter37
Of All Time 12VDC To 120VAC Inverter1,554,416
FM Transmitter1,026,840

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,114 61 *
Car Alarm Arming Horn Beep Canceller bob 142,850 6 *
Wireless Auto Tachometer 351,044 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,182 29 *
Parallel (Printer) Port Interface 296,545 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,860 63 *
3 Channel Spectrum Analyzer 231,071 20
40W Fluorescent Lamp Inverter Bart Milnes 337,707 60 *
Adjustable Strobe Light 318,376 36
Black Light 292,420 29
Colour (Sound) Organ 300,070 36
Electronic Dice NEW! 196,973 10 *
Fantastic Atom Expander 209,641 25
Flash Slave Trigger 229,429 18 *
Infa-Red Remote Control 647,679 216 *
IR Remote Extender NEW! 140,529 3 *
IR Remote Jammer Carl 275,227 110 *
IR Remote Switch NEW! 164,881 9 *
LASER Transmitter/Receiver 427,149 92
LED Chaser 456,505 83 *
LED Metronome NEW! 106,692 3 *
LED Thermometer 213,919 22 *
Light/Dark Detector 313,265 90 *
Simple Colour Organ 144,225 11 *
Strobe Light 283,160 27 *
TRIAC Light Dimmer 563,069 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,281 122 *
Electromagnetic Levitator NEW! 151,563 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,708 214 *
AC Motor Speed Controller 403,711 29 *
Air Flow Detector 259,326 54 *
Digital Keypad Combination Lock 209,155 20
Low Voltage Alarm 237,029 58 *
Pine Racecar Victory Judge 109,135 1 *
Pulse Width Modulation DC Motor Control 665,343 94
Rain Detector 312,885 112 *
Simple Lie Detector 574,739 323
Simple Polarity Tester Dudley LeRoux 172,832 13 *
Simple Servo Controller 229,854 22 *
Simple Touch Switch NEW! 177,918 6 *
Simple Two Speed Contactor DC Motor Controller 213,259 21 *
Stepper Motor Controller 763,190 120 *
Time Delay Relay 565,175 88
Time Delay Relay II jawaharlal@excite.com 255,468 39 *
Touch Switch 298,239 51 *
Video Activated Relay 128,721 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,738 10 *
Water Detector With Sump/Bilge Pump Controller 160,241 18 *
Wire Loop Alarm Alex Meaden 212,953 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,259 25 *
12VDC To 120VAC Inverter 1,554,416 691
6V to 12V Converter 538,796 121
Automatic 12V Lead Acid Battery Charger 948,808 248
Automatic Load Sensing Power Switch 175,364 16 *
Car Battery Charger 894,079 159 *
Dual Polarity Power Supply 380,792 84 *
Fixed Voltage Power Supply 319,996 52 *
High Current Power Supply 350,738 66 *
High Voltage High Current Power Supply 272,668 35 *
LASER Power Supply 305,454 28
Portable CD Player Adapter For Car 219,938 12 *
Power Supply 749,633 259 *
Solid State Tesla Coil NEW! 156,126 4
Solid State Tesla Coil/High Voltage Generator 456,440 51
Transformerless Power Supply 472,564 117 *
Voltage Inverter 352,418 51 *
Voltage Inverter II 211,879 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,776 182
3 Watt FM Transmitter Rae XL Tkacik 348,076 83 *
50 Watt Amplifier 519,000 74
8 Note Tune Player 147,984 12 *
8 Watt Audio Amp 385,070 67 *
Aircraft Radio Communications Receiver 289,917 50 *
Crystal Radio 168,659 53 *
Digital Volume Control 348,546 47 *
Electronic Stethoscope 331,646 142 *
FET Audio Mixer 352,969 41
FM Transmitter 1,026,840 420
Guitar Fuzz Effect 257,584 54 *
Microphone Mixer Anatoly I. Shikhatov 259,387 26 *
Mono To Stereo Synthesizer oRbEq 142,925 18 *
One Tube Regenerative Radio NEW! 158,724 4 *
Op Amp Radio 401,067 80 *
Single Chip AM Radio NEW! 107,744 4 *
Single Chip FM Radio NEW! 182,509 1 *
Sound Level Meter 351,177 51 *
Stereo Tube Amplifier Weslee Kinsler 277,494 15 *
Tone Control 319,348 31
Transistor Organ 208,972 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,475 27 *
FM Telephone Bug 242,092 57
Phone Busy Indicator 221,284 24 *
Remote Telephone Ringer 124,901 3 *
Ringing Phone Light Flasher 228,023 35 *
Simple Phone Tap Derek Tombrello 391,363 98 *
Telephone Hold Button 136,164 10
Telephone Recorder 223,983 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.