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
Thursday, March 26, 2026		 Telephone Hold Button8
IR Remote Jammer4
Yesterday
Wednesday, March 25, 2026		 12VDC To 120VAC Inverter47
Rain Detector37
Of All Time 12VDC To 120VAC Inverter1,561,944
FM Transmitter1,032,669

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,523 61 *
Car Alarm Arming Horn Beep Canceller bob 145,179 6 *
Wireless Auto Tachometer 354,043 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,194 29 *
Parallel (Printer) Port Interface 299,834 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,982 63 *
3 Channel Spectrum Analyzer 233,941 20
40W Fluorescent Lamp Inverter Bart Milnes 340,431 60 *
Adjustable Strobe Light 321,218 36
Black Light 295,995 29
Colour (Sound) Organ 303,367 36
Electronic Dice NEW! 199,772 10 *
Fantastic Atom Expander 212,060 25
Flash Slave Trigger 232,298 18 *
Infa-Red Remote Control 650,975 216 *
IR Remote Extender NEW! 143,279 3 *
IR Remote Jammer Carl 278,147 110 *
IR Remote Switch NEW! 167,541 9 *
LASER Transmitter/Receiver 430,425 92
LED Chaser 460,039 83 *
LED Metronome NEW! 109,294 3 *
LED Thermometer 216,232 22 *
Light/Dark Detector 315,768 90 *
Simple Colour Organ 146,563 11 *
Strobe Light 285,573 27 *
TRIAC Light Dimmer 566,573 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,710 122 *
Electromagnetic Levitator NEW! 154,038 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,475 214 *
AC Motor Speed Controller 407,472 29 *
Air Flow Detector 261,967 54 *
Digital Keypad Combination Lock 211,730 20
Low Voltage Alarm 239,867 58 *
Pine Racecar Victory Judge 111,429 1 *
Pulse Width Modulation DC Motor Control 668,745 94
Rain Detector 315,779 112 *
Simple Lie Detector 578,072 323
Simple Polarity Tester Dudley LeRoux 175,803 13 *
Simple Servo Controller 232,650 22 *
Simple Touch Switch NEW! 180,810 6 *
Simple Two Speed Contactor DC Motor Controller 216,066 21 *
Stepper Motor Controller 767,796 120 *
Time Delay Relay 568,239 88
Time Delay Relay II jawaharlal@excite.com 258,360 39 *
Touch Switch 301,011 51 *
Video Activated Relay 130,994 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,194 10 *
Water Detector With Sump/Bilge Pump Controller 163,161 18 *
Wire Loop Alarm Alex Meaden 215,286 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,136 25 *
12VDC To 120VAC Inverter 1,561,944 691
6V to 12V Converter 542,440 121
Automatic 12V Lead Acid Battery Charger 952,973 248
Automatic Load Sensing Power Switch 178,120 16 *
Car Battery Charger 897,653 159 *
Dual Polarity Power Supply 384,354 84 *
Fixed Voltage Power Supply 322,593 52 *
High Current Power Supply 354,391 66 *
High Voltage High Current Power Supply 275,718 35 *
LASER Power Supply 308,256 28
Portable CD Player Adapter For Car 222,713 12 *
Power Supply 752,965 259 *
Solid State Tesla Coil NEW! 159,822 4
Solid State Tesla Coil/High Voltage Generator 460,555 51
Transformerless Power Supply 475,754 117 *
Voltage Inverter 356,398 51 *
Voltage Inverter II 214,746 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,760 182
3 Watt FM Transmitter Rae XL Tkacik 351,844 83 *
50 Watt Amplifier 522,369 74
8 Note Tune Player 150,490 12 *
8 Watt Audio Amp 388,723 67 *
Aircraft Radio Communications Receiver 293,342 50 *
Crystal Radio 172,374 53 *
Digital Volume Control 351,810 47 *
Electronic Stethoscope 334,862 142 *
FET Audio Mixer 355,739 41
FM Transmitter 1,032,669 420
Guitar Fuzz Effect 261,237 54 *
Microphone Mixer Anatoly I. Shikhatov 262,209 26 *
Mono To Stereo Synthesizer oRbEq 145,894 18 *
One Tube Regenerative Radio NEW! 163,178 4 *
Op Amp Radio 404,464 80 *
Single Chip AM Radio NEW! 110,509 4 *
Single Chip FM Radio NEW! 185,862 1 *
Sound Level Meter 354,267 51 *
Stereo Tube Amplifier Weslee Kinsler 281,019 15 *
Tone Control 322,643 31
Transistor Organ 211,948 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,786 27 *
FM Telephone Bug 244,214 57
Phone Busy Indicator 223,691 24 *
Remote Telephone Ringer 127,303 3 *
Ringing Phone Light Flasher 231,208 35 *
Simple Phone Tap Derek Tombrello 393,844 98 *
Telephone Hold Button 138,308 10
Telephone Recorder 226,172 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.