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
Sunday, October 26, 2025		 Crystal Radio8
Transformerless Power Supply6
Yesterday
Saturday, October 25, 2025		 12VDC To 120VAC Inverter56
Voltage Inverter52
Of All Time 12VDC To 120VAC Inverter1,554,858
FM Transmitter1,027,195

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,252 61 *
Car Alarm Arming Horn Beep Canceller bob 142,992 6 *
Wireless Auto Tachometer 351,221 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,313 29 *
Parallel (Printer) Port Interface 296,740 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,037 63 *
3 Channel Spectrum Analyzer 231,253 20
40W Fluorescent Lamp Inverter Bart Milnes 337,857 60 *
Adjustable Strobe Light 318,547 36
Black Light 292,643 29
Colour (Sound) Organ 300,273 36
Electronic Dice NEW! 197,150 10 *
Fantastic Atom Expander 209,799 25
Flash Slave Trigger 229,613 18 *
Infa-Red Remote Control 647,902 216 *
IR Remote Extender NEW! 140,690 3 *
IR Remote Jammer Carl 275,405 110 *
IR Remote Switch NEW! 165,046 9 *
LASER Transmitter/Receiver 427,350 92
LED Chaser 456,738 83 *
LED Metronome NEW! 106,857 3 *
LED Thermometer 214,059 22 *
Light/Dark Detector 313,419 90 *
Simple Colour Organ 144,365 11 *
Strobe Light 283,302 27 *
TRIAC Light Dimmer 563,276 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,459 122 *
Electromagnetic Levitator NEW! 151,712 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,979 214 *
AC Motor Speed Controller 403,969 29 *
Air Flow Detector 259,475 54 *
Digital Keypad Combination Lock 209,297 20
Low Voltage Alarm 237,211 58 *
Pine Racecar Victory Judge 109,266 1 *
Pulse Width Modulation DC Motor Control 665,542 94
Rain Detector 313,052 112 *
Simple Lie Detector 574,955 323
Simple Polarity Tester Dudley LeRoux 173,012 13 *
Simple Servo Controller 230,011 22 *
Simple Touch Switch NEW! 178,101 6 *
Simple Two Speed Contactor DC Motor Controller 213,430 21 *
Stepper Motor Controller 763,504 120 *
Time Delay Relay 565,381 88
Time Delay Relay II jawaharlal@excite.com 255,620 39 *
Touch Switch 298,398 51 *
Video Activated Relay 128,860 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,912 10 *
Water Detector With Sump/Bilge Pump Controller 160,380 18 *
Wire Loop Alarm Alex Meaden 213,108 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,592 25 *
12VDC To 120VAC Inverter 1,554,858 691
6V to 12V Converter 539,012 121
Automatic 12V Lead Acid Battery Charger 949,021 248
Automatic Load Sensing Power Switch 175,534 16 *
Car Battery Charger 894,291 159 *
Dual Polarity Power Supply 381,000 84 *
Fixed Voltage Power Supply 320,143 52 *
High Current Power Supply 350,953 66 *
High Voltage High Current Power Supply 272,821 35 *
LASER Power Supply 305,611 28
Portable CD Player Adapter For Car 220,092 12 *
Power Supply 749,850 259 *
Solid State Tesla Coil NEW! 156,330 4
Solid State Tesla Coil/High Voltage Generator 456,665 51
Transformerless Power Supply 472,747 117 *
Voltage Inverter 352,750 51 *
Voltage Inverter II 212,037 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,941 182
3 Watt FM Transmitter Rae XL Tkacik 348,309 83 *
50 Watt Amplifier 519,188 74
8 Note Tune Player 148,115 12 *
8 Watt Audio Amp 385,278 67 *
Aircraft Radio Communications Receiver 290,103 50 *
Crystal Radio 168,892 53 *
Digital Volume Control 348,731 47 *
Electronic Stethoscope 331,866 142 *
FET Audio Mixer 353,128 41
FM Transmitter 1,027,195 420
Guitar Fuzz Effect 257,822 54 *
Microphone Mixer Anatoly I. Shikhatov 259,551 26 *
Mono To Stereo Synthesizer oRbEq 143,086 18 *
One Tube Regenerative Radio NEW! 158,999 4 *
Op Amp Radio 401,307 80 *
Single Chip AM Radio NEW! 107,880 4 *
Single Chip FM Radio NEW! 182,721 1 *
Sound Level Meter 351,351 51 *
Stereo Tube Amplifier Weslee Kinsler 277,714 15 *
Tone Control 319,536 31
Transistor Organ 209,172 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,600 27 *
FM Telephone Bug 242,226 57
Phone Busy Indicator 221,415 24 *
Remote Telephone Ringer 125,024 3 *
Ringing Phone Light Flasher 228,202 35 *
Simple Phone Tap Derek Tombrello 391,526 98 *
Telephone Hold Button 136,278 10
Telephone Recorder 224,108 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.