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, February 15, 2026		 12VDC To 120VAC Inverter34
FM Transmitter31
Yesterday
Saturday, February 14, 2026		 FM Transmitter51
12VDC To 120VAC Inverter46
Of All Time 12VDC To 120VAC Inverter1,560,340
FM Transmitter1,031,521

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,058 61 *
Car Alarm Arming Horn Beep Canceller bob 144,742 6 *
Wireless Auto Tachometer 353,395 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,770 29 *
Parallel (Printer) Port Interface 299,159 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,367 63 *
3 Channel Spectrum Analyzer 233,395 20
40W Fluorescent Lamp Inverter Bart Milnes 339,909 60 *
Adjustable Strobe Light 320,617 36
Black Light 295,322 29
Colour (Sound) Organ 302,655 36
Electronic Dice NEW! 199,213 10 *
Fantastic Atom Expander 211,570 25
Flash Slave Trigger 231,717 18 *
Infa-Red Remote Control 650,347 216 *
IR Remote Extender NEW! 142,741 3 *
IR Remote Jammer Carl 277,531 110 *
IR Remote Switch NEW! 167,054 9 *
LASER Transmitter/Receiver 429,702 92
LED Chaser 459,311 83 *
LED Metronome NEW! 108,773 3 *
LED Thermometer 215,749 22 *
Light/Dark Detector 315,205 90 *
Simple Colour Organ 146,136 11 *
Strobe Light 285,110 27 *
TRIAC Light Dimmer 565,800 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,677 122 *
Electromagnetic Levitator NEW! 153,513 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,541 214 *
AC Motor Speed Controller 406,745 29 *
Air Flow Detector 261,401 54 *
Digital Keypad Combination Lock 211,215 20
Low Voltage Alarm 239,325 58 *
Pine Racecar Victory Judge 110,963 1 *
Pulse Width Modulation DC Motor Control 668,084 94
Rain Detector 315,147 112 *
Simple Lie Detector 577,443 323
Simple Polarity Tester Dudley LeRoux 175,272 13 *
Simple Servo Controller 232,076 22 *
Simple Touch Switch NEW! 180,261 6 *
Simple Two Speed Contactor DC Motor Controller 215,474 21 *
Stepper Motor Controller 766,838 120 *
Time Delay Relay 567,575 88
Time Delay Relay II jawaharlal@excite.com 257,786 39 *
Touch Switch 300,444 51 *
Video Activated Relay 130,580 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,555 10 *
Water Detector With Sump/Bilge Pump Controller 162,560 18 *
Wire Loop Alarm Alex Meaden 214,801 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,132 25 *
12VDC To 120VAC Inverter 1,560,340 691
6V to 12V Converter 541,671 121
Automatic 12V Lead Acid Battery Charger 952,047 248
Automatic Load Sensing Power Switch 177,531 16 *
Car Battery Charger 896,904 159 *
Dual Polarity Power Supply 383,673 84 *
Fixed Voltage Power Supply 322,084 52 *
High Current Power Supply 353,667 66 *
High Voltage High Current Power Supply 275,062 35 *
LASER Power Supply 307,696 28
Portable CD Player Adapter For Car 222,184 12 *
Power Supply 752,263 259 *
Solid State Tesla Coil NEW! 159,059 4
Solid State Tesla Coil/High Voltage Generator 459,662 51
Transformerless Power Supply 475,174 117 *
Voltage Inverter 355,671 51 *
Voltage Inverter II 214,139 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,155 182
3 Watt FM Transmitter Rae XL Tkacik 351,091 83 *
50 Watt Amplifier 521,623 74
8 Note Tune Player 149,986 12 *
8 Watt Audio Amp 387,974 67 *
Aircraft Radio Communications Receiver 292,581 50 *
Crystal Radio 171,614 53 *
Digital Volume Control 351,188 47 *
Electronic Stethoscope 334,143 142 *
FET Audio Mixer 355,146 41
FM Transmitter 1,031,521 420
Guitar Fuzz Effect 260,499 54 *
Microphone Mixer Anatoly I. Shikhatov 261,580 26 *
Mono To Stereo Synthesizer oRbEq 145,288 18 *
One Tube Regenerative Radio NEW! 162,324 4 *
Op Amp Radio 403,734 80 *
Single Chip AM Radio NEW! 109,928 4 *
Single Chip FM Radio NEW! 185,223 1 *
Sound Level Meter 353,568 51 *
Stereo Tube Amplifier Weslee Kinsler 280,372 15 *
Tone Control 321,968 31
Transistor Organ 211,314 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,285 27 *
FM Telephone Bug 243,728 57
Phone Busy Indicator 223,142 24 *
Remote Telephone Ringer 126,775 3 *
Ringing Phone Light Flasher 230,497 35 *
Simple Phone Tap Derek Tombrello 393,301 98 *
Telephone Hold Button 137,833 10
Telephone Recorder 225,696 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.