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, March 24, 2026		 12VDC To 120VAC Inverter30
Stepper Motor Controller18
Yesterday
Monday, March 23, 2026		 12VDC To 120VAC Inverter43
FM Transmitter31
Of All Time 12VDC To 120VAC Inverter1,561,862
FM Transmitter1,032,620

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,509 61 *
Car Alarm Arming Horn Beep Canceller bob 145,164 6 *
Wireless Auto Tachometer 354,010 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,176 29 *
Parallel (Printer) Port Interface 299,799 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,952 63 *
3 Channel Spectrum Analyzer 233,914 20
40W Fluorescent Lamp Inverter Bart Milnes 340,394 60 *
Adjustable Strobe Light 321,193 36
Black Light 295,962 29
Colour (Sound) Organ 303,330 36
Electronic Dice NEW! 199,741 10 *
Fantastic Atom Expander 212,037 25
Flash Slave Trigger 232,272 18 *
Infa-Red Remote Control 650,946 216 *
IR Remote Extender NEW! 143,249 3 *
IR Remote Jammer Carl 278,107 110 *
IR Remote Switch NEW! 167,515 9 *
LASER Transmitter/Receiver 430,378 92
LED Chaser 460,002 83 *
LED Metronome NEW! 109,252 3 *
LED Thermometer 216,196 22 *
Light/Dark Detector 315,734 90 *
Simple Colour Organ 146,541 11 *
Strobe Light 285,550 27 *
TRIAC Light Dimmer 566,547 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,682 122 *
Electromagnetic Levitator NEW! 154,013 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,427 214 *
AC Motor Speed Controller 407,433 29 *
Air Flow Detector 261,937 54 *
Digital Keypad Combination Lock 211,701 20
Low Voltage Alarm 239,840 58 *
Pine Racecar Victory Judge 111,409 1 *
Pulse Width Modulation DC Motor Control 668,708 94
Rain Detector 315,715 112 *
Simple Lie Detector 578,035 323
Simple Polarity Tester Dudley LeRoux 175,776 13 *
Simple Servo Controller 232,623 22 *
Simple Touch Switch NEW! 180,781 6 *
Simple Two Speed Contactor DC Motor Controller 216,039 21 *
Stepper Motor Controller 767,745 120 *
Time Delay Relay 568,212 88
Time Delay Relay II jawaharlal@excite.com 258,325 39 *
Touch Switch 300,970 51 *
Video Activated Relay 130,973 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,170 10 *
Water Detector With Sump/Bilge Pump Controller 163,129 18 *
Wire Loop Alarm Alex Meaden 215,266 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,090 25 *
12VDC To 120VAC Inverter 1,561,862 691
6V to 12V Converter 542,408 121
Automatic 12V Lead Acid Battery Charger 952,933 248
Automatic Load Sensing Power Switch 178,101 16 *
Car Battery Charger 897,622 159 *
Dual Polarity Power Supply 384,330 84 *
Fixed Voltage Power Supply 322,570 52 *
High Current Power Supply 354,340 66 *
High Voltage High Current Power Supply 275,686 35 *
LASER Power Supply 308,228 28
Portable CD Player Adapter For Car 222,688 12 *
Power Supply 752,935 259 *
Solid State Tesla Coil NEW! 159,783 4
Solid State Tesla Coil/High Voltage Generator 460,502 51
Transformerless Power Supply 475,738 117 *
Voltage Inverter 356,368 51 *
Voltage Inverter II 214,720 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,733 182
3 Watt FM Transmitter Rae XL Tkacik 351,812 83 *
50 Watt Amplifier 522,328 74
8 Note Tune Player 150,467 12 *
8 Watt Audio Amp 388,686 67 *
Aircraft Radio Communications Receiver 293,304 50 *
Crystal Radio 172,344 53 *
Digital Volume Control 351,786 47 *
Electronic Stethoscope 334,832 142 *
FET Audio Mixer 355,716 41
FM Transmitter 1,032,620 420
Guitar Fuzz Effect 261,204 54 *
Microphone Mixer Anatoly I. Shikhatov 262,183 26 *
Mono To Stereo Synthesizer oRbEq 145,874 18 *
One Tube Regenerative Radio NEW! 163,152 4 *
Op Amp Radio 404,439 80 *
Single Chip AM Radio NEW! 110,481 4 *
Single Chip FM Radio NEW! 185,839 1 *
Sound Level Meter 354,240 51 *
Stereo Tube Amplifier Weslee Kinsler 280,991 15 *
Tone Control 322,596 31
Transistor Organ 211,930 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,758 27 *
FM Telephone Bug 244,193 57
Phone Busy Indicator 223,662 24 *
Remote Telephone Ringer 127,275 3 *
Ringing Phone Light Flasher 231,173 35 *
Simple Phone Tap Derek Tombrello 393,815 98 *
Telephone Hold Button 138,281 10
Telephone Recorder 226,153 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.