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 01, 2025		 12VDC To 120VAC Inverter34
Stepper Motor Controller19
Yesterday
Tuesday, September 30, 2025		 Stepper Motor Controller43
12V To 24V DC-DC Converter36
Of All Time 12VDC To 120VAC Inverter1,553,847
FM Transmitter1,026,340

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,945 61 *
Car Alarm Arming Horn Beep Canceller bob 142,712 6 *
Wireless Auto Tachometer 350,844 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,039 29 *
Parallel (Printer) Port Interface 296,183 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,636 63 *
3 Channel Spectrum Analyzer 230,831 20
40W Fluorescent Lamp Inverter Bart Milnes 337,505 60 *
Adjustable Strobe Light 318,147 36
Black Light 292,158 29
Colour (Sound) Organ 299,829 36
Electronic Dice NEW! 196,752 10 *
Fantastic Atom Expander 209,484 25
Flash Slave Trigger 229,232 18 *
Infa-Red Remote Control 647,419 216 *
IR Remote Extender NEW! 140,337 3 *
IR Remote Jammer Carl 275,001 110 *
IR Remote Switch NEW! 164,710 9 *
LASER Transmitter/Receiver 426,932 92
LED Chaser 456,156 83 *
LED Metronome NEW! 106,514 3 *
LED Thermometer 213,772 22 *
Light/Dark Detector 313,085 90 *
Simple Colour Organ 144,054 11 *
Strobe Light 282,991 27 *
TRIAC Light Dimmer 562,835 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,927 122 *
Electromagnetic Levitator NEW! 151,392 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,344 214 *
AC Motor Speed Controller 403,364 29 *
Air Flow Detector 259,161 54 *
Digital Keypad Combination Lock 208,991 20
Low Voltage Alarm 236,835 58 *
Pine Racecar Victory Judge 108,973 1 *
Pulse Width Modulation DC Motor Control 665,120 94
Rain Detector 312,704 112 *
Simple Lie Detector 574,472 323
Simple Polarity Tester Dudley LeRoux 172,627 13 *
Simple Servo Controller 229,650 22 *
Simple Touch Switch NEW! 177,694 6 *
Simple Two Speed Contactor DC Motor Controller 213,071 21 *
Stepper Motor Controller 762,752 120 *
Time Delay Relay 564,948 88
Time Delay Relay II jawaharlal@excite.com 255,274 39 *
Touch Switch 298,035 51 *
Video Activated Relay 128,554 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,521 10 *
Water Detector With Sump/Bilge Pump Controller 160,074 18 *
Wire Loop Alarm Alex Meaden 212,770 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 328,600 25 *
12VDC To 120VAC Inverter 1,553,847 691
6V to 12V Converter 538,514 121
Automatic 12V Lead Acid Battery Charger 948,537 248
Automatic Load Sensing Power Switch 175,171 16 *
Car Battery Charger 893,832 159 *
Dual Polarity Power Supply 380,547 84 *
Fixed Voltage Power Supply 319,817 52 *
High Current Power Supply 350,468 66 *
High Voltage High Current Power Supply 272,458 35 *
LASER Power Supply 305,275 28
Portable CD Player Adapter For Car 219,766 12 *
Power Supply 749,424 259 *
Solid State Tesla Coil NEW! 155,867 4
Solid State Tesla Coil/High Voltage Generator 456,149 51
Transformerless Power Supply 472,366 117 *
Voltage Inverter 352,102 51 *
Voltage Inverter II 211,689 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,575 182
3 Watt FM Transmitter Rae XL Tkacik 347,763 83 *
50 Watt Amplifier 518,727 74
8 Note Tune Player 147,831 12 *
8 Watt Audio Amp 384,773 67 *
Aircraft Radio Communications Receiver 289,679 50 *
Crystal Radio 168,349 53 *
Digital Volume Control 348,344 47 *
Electronic Stethoscope 331,394 142 *
FET Audio Mixer 352,782 41
FM Transmitter 1,026,340 420
Guitar Fuzz Effect 257,306 54 *
Microphone Mixer Anatoly I. Shikhatov 259,181 26 *
Mono To Stereo Synthesizer oRbEq 142,696 18 *
One Tube Regenerative Radio NEW! 158,316 4 *
Op Amp Radio 400,789 80 *
Single Chip AM Radio NEW! 107,576 4 *
Single Chip FM Radio NEW! 182,187 1 *
Sound Level Meter 350,960 51 *
Stereo Tube Amplifier Weslee Kinsler 277,240 15 *
Tone Control 319,089 31
Transistor Organ 208,754 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,325 27 *
FM Telephone Bug 241,937 57
Phone Busy Indicator 221,106 24 *
Remote Telephone Ringer 124,753 3 *
Ringing Phone Light Flasher 227,748 35 *
Simple Phone Tap Derek Tombrello 391,178 98 *
Telephone Hold Button 136,024 10
Telephone Recorder 223,810 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.