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
Tuesday, September 16, 2025		 Voltage Inverter11
Simple Servo Controller10
Yesterday
Monday, September 15, 2025		 12VDC To 120VAC Inverter80
12VDC To 120VAC Inverter80
Of All Time 12VDC To 120VAC Inverter1,553,092
FM Transmitter1,025,717

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,652 61 *
Car Alarm Arming Horn Beep Canceller bob 142,466 6 *
Wireless Auto Tachometer 350,538 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,798 29 *
Parallel (Printer) Port Interface 295,693 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,269 63 *
3 Channel Spectrum Analyzer 230,481 20
40W Fluorescent Lamp Inverter Bart Milnes 337,205 60 *
Adjustable Strobe Light 317,815 36
Black Light 291,761 29
Colour (Sound) Organ 299,464 36
Electronic Dice NEW! 196,428 10 *
Fantastic Atom Expander 209,210 25
Flash Slave Trigger 228,903 18 *
Infa-Red Remote Control 647,018 216 *
IR Remote Extender NEW! 140,015 3 *
IR Remote Jammer Carl 274,658 110 *
IR Remote Switch NEW! 164,372 9 *
LASER Transmitter/Receiver 426,595 92
LED Chaser 455,656 83 *
LED Metronome NEW! 106,225 3 *
LED Thermometer 213,485 22 *
Light/Dark Detector 312,762 90 *
Simple Colour Organ 143,754 11 *
Strobe Light 282,688 27 *
TRIAC Light Dimmer 562,484 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,551 122 *
Electromagnetic Levitator NEW! 151,123 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,889 214 *
AC Motor Speed Controller 402,845 29 *
Air Flow Detector 258,889 54 *
Digital Keypad Combination Lock 208,676 20
Low Voltage Alarm 236,518 58 *
Pine Racecar Victory Judge 108,714 1 *
Pulse Width Modulation DC Motor Control 664,731 94
Rain Detector 312,406 112 *
Simple Lie Detector 574,015 323
Simple Polarity Tester Dudley LeRoux 172,333 13 *
Simple Servo Controller 229,292 22 *
Simple Touch Switch NEW! 177,363 6 *
Simple Two Speed Contactor DC Motor Controller 212,737 21 *
Stepper Motor Controller 762,165 120 *
Time Delay Relay 564,592 88
Time Delay Relay II jawaharlal@excite.com 254,940 39 *
Touch Switch 297,702 51 *
Video Activated Relay 128,271 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,172 10 *
Water Detector With Sump/Bilge Pump Controller 159,796 18 *
Wire Loop Alarm Alex Meaden 212,464 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 327,998 25 *
12VDC To 120VAC Inverter 1,553,092 691
6V to 12V Converter 538,141 121
Automatic 12V Lead Acid Battery Charger 948,109 248
Automatic Load Sensing Power Switch 174,866 16 *
Car Battery Charger 893,357 159 *
Dual Polarity Power Supply 380,150 84 *
Fixed Voltage Power Supply 319,530 52 *
High Current Power Supply 350,077 66 *
High Voltage High Current Power Supply 272,139 35 *
LASER Power Supply 304,956 28
Portable CD Player Adapter For Car 219,467 12 *
Power Supply 749,062 259 *
Solid State Tesla Coil NEW! 155,420 4
Solid State Tesla Coil/High Voltage Generator 455,713 51
Transformerless Power Supply 472,007 117 *
Voltage Inverter 351,652 51 *
Voltage Inverter II 211,384 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,226 182
3 Watt FM Transmitter Rae XL Tkacik 347,363 83 *
50 Watt Amplifier 518,350 74
8 Note Tune Player 147,552 12 *
8 Watt Audio Amp 384,264 67 *
Aircraft Radio Communications Receiver 289,263 50 *
Crystal Radio 167,954 53 *
Digital Volume Control 347,982 47 *
Electronic Stethoscope 331,004 142 *
FET Audio Mixer 352,457 41
FM Transmitter 1,025,717 420
Guitar Fuzz Effect 256,929 54 *
Microphone Mixer Anatoly I. Shikhatov 258,800 26 *
Mono To Stereo Synthesizer oRbEq 142,368 18 *
One Tube Regenerative Radio NEW! 157,742 4 *
Op Amp Radio 400,406 80 *
Single Chip AM Radio NEW! 107,265 4 *
Single Chip FM Radio NEW! 181,799 1 *
Sound Level Meter 350,609 51 *
Stereo Tube Amplifier Weslee Kinsler 276,812 15 *
Tone Control 318,697 31
Transistor Organ 208,412 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,046 27 *
FM Telephone Bug 241,645 57
Phone Busy Indicator 220,808 24 *
Remote Telephone Ringer 124,480 3 *
Ringing Phone Light Flasher 227,349 35 *
Simple Phone Tap Derek Tombrello 390,889 98 *
Telephone Hold Button 135,764 10
Telephone Recorder 223,535 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.