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 15, 2025		 12VDC To 120VAC Inverter38
FM Transmitter30
Yesterday
Tuesday, October 14, 2025		 12V To 24V DC-DC Converter42
FM Transmitter35
Of All Time 12VDC To 120VAC Inverter1,554,381
FM Transmitter1,026,816

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,100 61 *
Car Alarm Arming Horn Beep Canceller bob 142,842 6 *
Wireless Auto Tachometer 351,031 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,175 29 *
Parallel (Printer) Port Interface 296,534 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,843 63 *
3 Channel Spectrum Analyzer 231,062 20
40W Fluorescent Lamp Inverter Bart Milnes 337,701 60 *
Adjustable Strobe Light 318,364 36
Black Light 292,399 29
Colour (Sound) Organ 300,055 36
Electronic Dice NEW! 196,960 10 *
Fantastic Atom Expander 209,629 25
Flash Slave Trigger 229,417 18 *
Infa-Red Remote Control 647,665 216 *
IR Remote Extender NEW! 140,518 3 *
IR Remote Jammer Carl 275,218 110 *
IR Remote Switch NEW! 164,871 9 *
LASER Transmitter/Receiver 427,136 92
LED Chaser 456,479 83 *
LED Metronome NEW! 106,677 3 *
LED Thermometer 213,911 22 *
Light/Dark Detector 313,251 90 *
Simple Colour Organ 144,219 11 *
Strobe Light 283,146 27 *
TRIAC Light Dimmer 563,055 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,263 122 *
Electromagnetic Levitator NEW! 151,554 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,695 214 *
AC Motor Speed Controller 403,701 29 *
Air Flow Detector 259,314 54 *
Digital Keypad Combination Lock 209,150 20
Low Voltage Alarm 237,020 58 *
Pine Racecar Victory Judge 109,128 1 *
Pulse Width Modulation DC Motor Control 665,330 94
Rain Detector 312,879 112 *
Simple Lie Detector 574,727 323
Simple Polarity Tester Dudley LeRoux 172,820 13 *
Simple Servo Controller 229,848 22 *
Simple Touch Switch NEW! 177,905 6 *
Simple Two Speed Contactor DC Motor Controller 213,253 21 *
Stepper Motor Controller 763,169 120 *
Time Delay Relay 565,169 88
Time Delay Relay II jawaharlal@excite.com 255,462 39 *
Touch Switch 298,227 51 *
Video Activated Relay 128,714 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,726 10 *
Water Detector With Sump/Bilge Pump Controller 160,224 18 *
Wire Loop Alarm Alex Meaden 212,940 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,236 25 *
12VDC To 120VAC Inverter 1,554,381 691
6V to 12V Converter 538,774 121
Automatic 12V Lead Acid Battery Charger 948,796 248
Automatic Load Sensing Power Switch 175,352 16 *
Car Battery Charger 894,070 159 *
Dual Polarity Power Supply 380,781 84 *
Fixed Voltage Power Supply 319,988 52 *
High Current Power Supply 350,728 66 *
High Voltage High Current Power Supply 272,656 35 *
LASER Power Supply 305,443 28
Portable CD Player Adapter For Car 219,926 12 *
Power Supply 749,619 259 *
Solid State Tesla Coil NEW! 156,111 4
Solid State Tesla Coil/High Voltage Generator 456,420 51
Transformerless Power Supply 472,553 117 *
Voltage Inverter 352,400 51 *
Voltage Inverter II 211,869 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,767 182
3 Watt FM Transmitter Rae XL Tkacik 348,057 83 *
50 Watt Amplifier 518,976 74
8 Note Tune Player 147,975 12 *
8 Watt Audio Amp 385,056 67 *
Aircraft Radio Communications Receiver 289,911 50 *
Crystal Radio 168,647 53 *
Digital Volume Control 348,537 47 *
Electronic Stethoscope 331,633 142 *
FET Audio Mixer 352,962 41
FM Transmitter 1,026,816 420
Guitar Fuzz Effect 257,573 54 *
Microphone Mixer Anatoly I. Shikhatov 259,375 26 *
Mono To Stereo Synthesizer oRbEq 142,920 18 *
One Tube Regenerative Radio NEW! 158,700 4 *
Op Amp Radio 401,059 80 *
Single Chip AM Radio NEW! 107,733 4 *
Single Chip FM Radio NEW! 182,490 1 *
Sound Level Meter 351,168 51 *
Stereo Tube Amplifier Weslee Kinsler 277,477 15 *
Tone Control 319,333 31
Transistor Organ 208,963 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,468 27 *
FM Telephone Bug 242,082 57
Phone Busy Indicator 221,266 24 *
Remote Telephone Ringer 124,894 3 *
Ringing Phone Light Flasher 228,013 35 *
Simple Phone Tap Derek Tombrello 391,353 98 *
Telephone Hold Button 136,158 10
Telephone Recorder 223,971 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.