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
Friday, October 17, 2025		 12V To 24V DC-DC Converter25
Voltage Inverter24
Yesterday
Thursday, October 16, 2025		 12VDC To 120VAC Inverter49
Power Supply33
Of All Time 12VDC To 120VAC Inverter1,554,465
FM Transmitter1,026,876

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,128 61 *
Car Alarm Arming Horn Beep Canceller bob 142,869 6 *
Wireless Auto Tachometer 351,067 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,196 29 *
Parallel (Printer) Port Interface 296,568 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,880 63 *
3 Channel Spectrum Analyzer 231,085 20
40W Fluorescent Lamp Inverter Bart Milnes 337,721 60 *
Adjustable Strobe Light 318,395 36
Black Light 292,433 29
Colour (Sound) Organ 300,094 36
Electronic Dice NEW! 196,991 10 *
Fantastic Atom Expander 209,661 25
Flash Slave Trigger 229,450 18 *
Infa-Red Remote Control 647,707 216 *
IR Remote Extender NEW! 140,542 3 *
IR Remote Jammer Carl 275,251 110 *
IR Remote Switch NEW! 164,898 9 *
LASER Transmitter/Receiver 427,168 92
LED Chaser 456,522 83 *
LED Metronome NEW! 106,708 3 *
LED Thermometer 213,934 22 *
Light/Dark Detector 313,281 90 *
Simple Colour Organ 144,242 11 *
Strobe Light 283,170 27 *
TRIAC Light Dimmer 563,097 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,297 122 *
Electromagnetic Levitator NEW! 151,574 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,734 214 *
AC Motor Speed Controller 403,740 29 *
Air Flow Detector 259,344 54 *
Digital Keypad Combination Lock 209,166 20
Low Voltage Alarm 237,056 58 *
Pine Racecar Victory Judge 109,149 1 *
Pulse Width Modulation DC Motor Control 665,376 94
Rain Detector 312,906 112 *
Simple Lie Detector 574,758 323
Simple Polarity Tester Dudley LeRoux 172,859 13 *
Simple Servo Controller 229,865 22 *
Simple Touch Switch NEW! 177,944 6 *
Simple Two Speed Contactor DC Motor Controller 213,275 21 *
Stepper Motor Controller 763,225 120 *
Time Delay Relay 565,197 88
Time Delay Relay II jawaharlal@excite.com 255,486 39 *
Touch Switch 298,252 51 *
Video Activated Relay 128,734 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,759 10 *
Water Detector With Sump/Bilge Pump Controller 160,252 18 *
Wire Loop Alarm Alex Meaden 212,965 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,299 25 *
12VDC To 120VAC Inverter 1,554,465 691
6V to 12V Converter 538,819 121
Automatic 12V Lead Acid Battery Charger 948,835 248
Automatic Load Sensing Power Switch 175,388 16 *
Car Battery Charger 894,110 159 *
Dual Polarity Power Supply 380,814 84 *
Fixed Voltage Power Supply 320,007 52 *
High Current Power Supply 350,778 66 *
High Voltage High Current Power Supply 272,680 35 *
LASER Power Supply 305,472 28
Portable CD Player Adapter For Car 219,956 12 *
Power Supply 749,671 259 *
Solid State Tesla Coil NEW! 156,147 4
Solid State Tesla Coil/High Voltage Generator 456,465 51
Transformerless Power Supply 472,582 117 *
Voltage Inverter 352,457 51 *
Voltage Inverter II 211,901 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,791 182
3 Watt FM Transmitter Rae XL Tkacik 348,104 83 *
50 Watt Amplifier 519,015 74
8 Note Tune Player 147,998 12 *
8 Watt Audio Amp 385,090 67 *
Aircraft Radio Communications Receiver 289,940 50 *
Crystal Radio 168,686 53 *
Digital Volume Control 348,558 47 *
Electronic Stethoscope 331,666 142 *
FET Audio Mixer 352,981 41
FM Transmitter 1,026,876 420
Guitar Fuzz Effect 257,602 54 *
Microphone Mixer Anatoly I. Shikhatov 259,399 26 *
Mono To Stereo Synthesizer oRbEq 142,945 18 *
One Tube Regenerative Radio NEW! 158,746 4 *
Op Amp Radio 401,097 80 *
Single Chip AM Radio NEW! 107,758 4 *
Single Chip FM Radio NEW! 182,525 1 *
Sound Level Meter 351,195 51 *
Stereo Tube Amplifier Weslee Kinsler 277,517 15 *
Tone Control 319,369 31
Transistor Organ 208,989 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,490 27 *
FM Telephone Bug 242,106 57
Phone Busy Indicator 221,298 24 *
Remote Telephone Ringer 124,913 3 *
Ringing Phone Light Flasher 228,046 35 *
Simple Phone Tap Derek Tombrello 391,385 98 *
Telephone Hold Button 136,174 10
Telephone Recorder 223,995 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.