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, March 25, 2026		 Rain Detector20
High Current Power Supply19
Yesterday
Tuesday, March 24, 2026		 12VDC To 120VAC Inverter60
Stepper Motor Controller43
Of All Time 12VDC To 120VAC Inverter1,561,912
FM Transmitter1,032,646

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,516 61 *
Car Alarm Arming Horn Beep Canceller bob 145,175 6 *
Wireless Auto Tachometer 354,032 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,184 29 *
Parallel (Printer) Port Interface 299,816 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,971 63 *
3 Channel Spectrum Analyzer 233,931 20
40W Fluorescent Lamp Inverter Bart Milnes 340,419 60 *
Adjustable Strobe Light 321,202 36
Black Light 295,977 29
Colour (Sound) Organ 303,350 36
Electronic Dice NEW! 199,749 10 *
Fantastic Atom Expander 212,050 25
Flash Slave Trigger 232,283 18 *
Infa-Red Remote Control 650,964 216 *
IR Remote Extender NEW! 143,265 3 *
IR Remote Jammer Carl 278,119 110 *
IR Remote Switch NEW! 167,525 9 *
LASER Transmitter/Receiver 430,407 92
LED Chaser 460,017 83 *
LED Metronome NEW! 109,275 3 *
LED Thermometer 216,208 22 *
Light/Dark Detector 315,749 90 *
Simple Colour Organ 146,550 11 *
Strobe Light 285,561 27 *
TRIAC Light Dimmer 566,563 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,697 122 *
Electromagnetic Levitator NEW! 154,030 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,456 214 *
AC Motor Speed Controller 407,457 29 *
Air Flow Detector 261,952 54 *
Digital Keypad Combination Lock 211,720 20
Low Voltage Alarm 239,853 58 *
Pine Racecar Victory Judge 111,421 1 *
Pulse Width Modulation DC Motor Control 668,736 94
Rain Detector 315,761 112 *
Simple Lie Detector 578,057 323
Simple Polarity Tester Dudley LeRoux 175,789 13 *
Simple Servo Controller 232,638 22 *
Simple Touch Switch NEW! 180,799 6 *
Simple Two Speed Contactor DC Motor Controller 216,052 21 *
Stepper Motor Controller 767,775 120 *
Time Delay Relay 568,228 88
Time Delay Relay II jawaharlal@excite.com 258,353 39 *
Touch Switch 300,998 51 *
Video Activated Relay 130,988 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,187 10 *
Water Detector With Sump/Bilge Pump Controller 163,146 18 *
Wire Loop Alarm Alex Meaden 215,282 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,115 25 *
12VDC To 120VAC Inverter 1,561,912 691
6V to 12V Converter 542,420 121
Automatic 12V Lead Acid Battery Charger 952,951 248
Automatic Load Sensing Power Switch 178,110 16 *
Car Battery Charger 897,637 159 *
Dual Polarity Power Supply 384,345 84 *
Fixed Voltage Power Supply 322,581 52 *
High Current Power Supply 354,372 66 *
High Voltage High Current Power Supply 275,700 35 *
LASER Power Supply 308,244 28
Portable CD Player Adapter For Car 222,702 12 *
Power Supply 752,952 259 *
Solid State Tesla Coil NEW! 159,808 4
Solid State Tesla Coil/High Voltage Generator 460,528 51
Transformerless Power Supply 475,745 117 *
Voltage Inverter 356,386 51 *
Voltage Inverter II 214,729 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,749 182
3 Watt FM Transmitter Rae XL Tkacik 351,827 83 *
50 Watt Amplifier 522,348 74
8 Note Tune Player 150,483 12 *
8 Watt Audio Amp 388,711 67 *
Aircraft Radio Communications Receiver 293,324 50 *
Crystal Radio 172,365 53 *
Digital Volume Control 351,801 47 *
Electronic Stethoscope 334,845 142 *
FET Audio Mixer 355,730 41
FM Transmitter 1,032,646 420
Guitar Fuzz Effect 261,226 54 *
Microphone Mixer Anatoly I. Shikhatov 262,198 26 *
Mono To Stereo Synthesizer oRbEq 145,887 18 *
One Tube Regenerative Radio NEW! 163,166 4 *
Op Amp Radio 404,453 80 *
Single Chip AM Radio NEW! 110,502 4 *
Single Chip FM Radio NEW! 185,850 1 *
Sound Level Meter 354,255 51 *
Stereo Tube Amplifier Weslee Kinsler 281,004 15 *
Tone Control 322,630 31
Transistor Organ 211,938 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,777 27 *
FM Telephone Bug 244,204 57
Phone Busy Indicator 223,679 24 *
Remote Telephone Ringer 127,290 3 *
Ringing Phone Light Flasher 231,195 35 *
Simple Phone Tap Derek Tombrello 393,831 98 *
Telephone Hold Button 138,291 10
Telephone Recorder 226,164 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.