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
Wednesday, October 22, 2025		 One Tube Regenerative Radio15
IR Remote Jammer13
Yesterday
Tuesday, October 21, 2025		 12VDC To 120VAC Inverter52
12V To 24V DC-DC Converter42
Of All Time 12VDC To 120VAC Inverter1,554,670
FM Transmitter1,027,048

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,185 61 *
Car Alarm Arming Horn Beep Canceller bob 142,923 6 *
Wireless Auto Tachometer 351,149 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,256 29 *
Parallel (Printer) Port Interface 296,645 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,964 63 *
3 Channel Spectrum Analyzer 231,169 20
40W Fluorescent Lamp Inverter Bart Milnes 337,794 60 *
Adjustable Strobe Light 318,471 36
Black Light 292,526 29
Colour (Sound) Organ 300,176 36
Electronic Dice NEW! 197,072 10 *
Fantastic Atom Expander 209,722 25
Flash Slave Trigger 229,535 18 *
Infa-Red Remote Control 647,801 216 *
IR Remote Extender NEW! 140,615 3 *
IR Remote Jammer Carl 275,324 110 *
IR Remote Switch NEW! 164,973 9 *
LASER Transmitter/Receiver 427,257 92
LED Chaser 456,645 83 *
LED Metronome NEW! 106,787 3 *
LED Thermometer 214,000 22 *
Light/Dark Detector 313,355 90 *
Simple Colour Organ 144,309 11 *
Strobe Light 283,226 27 *
TRIAC Light Dimmer 563,191 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,380 122 *
Electromagnetic Levitator NEW! 151,649 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,854 214 *
AC Motor Speed Controller 403,855 29 *
Air Flow Detector 259,414 54 *
Digital Keypad Combination Lock 209,235 20
Low Voltage Alarm 237,145 58 *
Pine Racecar Victory Judge 109,207 1 *
Pulse Width Modulation DC Motor Control 665,451 94
Rain Detector 312,981 112 *
Simple Lie Detector 574,863 323
Simple Polarity Tester Dudley LeRoux 172,939 13 *
Simple Servo Controller 229,949 22 *
Simple Touch Switch NEW! 178,032 6 *
Simple Two Speed Contactor DC Motor Controller 213,355 21 *
Stepper Motor Controller 763,367 120 *
Time Delay Relay 565,293 88
Time Delay Relay II jawaharlal@excite.com 255,559 39 *
Touch Switch 298,326 51 *
Video Activated Relay 128,788 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,837 10 *
Water Detector With Sump/Bilge Pump Controller 160,321 18 *
Wire Loop Alarm Alex Meaden 213,033 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,450 25 *
12VDC To 120VAC Inverter 1,554,670 691
6V to 12V Converter 538,933 121
Automatic 12V Lead Acid Battery Charger 948,925 248
Automatic Load Sensing Power Switch 175,459 16 *
Car Battery Charger 894,200 159 *
Dual Polarity Power Supply 380,905 84 *
Fixed Voltage Power Supply 320,073 52 *
High Current Power Supply 350,851 66 *
High Voltage High Current Power Supply 272,750 35 *
LASER Power Supply 305,536 28
Portable CD Player Adapter For Car 220,012 12 *
Power Supply 749,769 259 *
Solid State Tesla Coil NEW! 156,239 4
Solid State Tesla Coil/High Voltage Generator 456,567 51
Transformerless Power Supply 472,668 117 *
Voltage Inverter 352,613 51 *
Voltage Inverter II 211,964 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,857 182
3 Watt FM Transmitter Rae XL Tkacik 348,222 83 *
50 Watt Amplifier 519,105 74
8 Note Tune Player 148,049 12 *
8 Watt Audio Amp 385,183 67 *
Aircraft Radio Communications Receiver 290,023 50 *
Crystal Radio 168,803 53 *
Digital Volume Control 348,651 47 *
Electronic Stethoscope 331,763 142 *
FET Audio Mixer 353,056 41
FM Transmitter 1,027,048 420
Guitar Fuzz Effect 257,704 54 *
Microphone Mixer Anatoly I. Shikhatov 259,478 26 *
Mono To Stereo Synthesizer oRbEq 143,010 18 *
One Tube Regenerative Radio NEW! 158,864 4 *
Op Amp Radio 401,205 80 *
Single Chip AM Radio NEW! 107,823 4 *
Single Chip FM Radio NEW! 182,635 1 *
Sound Level Meter 351,277 51 *
Stereo Tube Amplifier Weslee Kinsler 277,624 15 *
Tone Control 319,457 31
Transistor Organ 209,085 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,554 27 *
FM Telephone Bug 242,166 57
Phone Busy Indicator 221,361 24 *
Remote Telephone Ringer 124,971 3 *
Ringing Phone Light Flasher 228,132 35 *
Simple Phone Tap Derek Tombrello 391,456 98 *
Telephone Hold Button 136,228 10
Telephone Recorder 224,058 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.