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, January 07, 2026		 12VDC To 120VAC Inverter54
6V to 12V Converter33
Yesterday
Tuesday, January 06, 2026		 12VDC To 120VAC Inverter45
Single Chip FM Radio37
Of All Time 12VDC To 120VAC Inverter1,558,509
FM Transmitter1,030,136

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,466 61 *
Car Alarm Arming Horn Beep Canceller bob 144,211 6 *
Wireless Auto Tachometer 352,683 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,308 29 *
Parallel (Printer) Port Interface 298,441 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,624 63 *
3 Channel Spectrum Analyzer 232,704 20
40W Fluorescent Lamp Inverter Bart Milnes 339,200 60 *
Adjustable Strobe Light 319,974 36
Black Light 294,477 29
Colour (Sound) Organ 301,885 36
Electronic Dice NEW! 198,597 10 *
Fantastic Atom Expander 211,016 25
Flash Slave Trigger 231,024 18 *
Infa-Red Remote Control 649,612 216 *
IR Remote Extender NEW! 142,076 3 *
IR Remote Jammer Carl 276,941 110 *
IR Remote Switch NEW! 166,435 9 *
LASER Transmitter/Receiver 428,938 92
LED Chaser 458,500 83 *
LED Metronome NEW! 108,191 3 *
LED Thermometer 215,219 22 *
Light/Dark Detector 314,666 90 *
Simple Colour Organ 145,621 11 *
Strobe Light 284,549 27 *
TRIAC Light Dimmer 564,959 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,953 122 *
Electromagnetic Levitator NEW! 152,950 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,570 214 *
AC Motor Speed Controller 405,936 29 *
Air Flow Detector 260,809 54 *
Digital Keypad Combination Lock 210,656 20
Low Voltage Alarm 238,699 58 *
Pine Racecar Victory Judge 110,443 1 *
Pulse Width Modulation DC Motor Control 667,256 94
Rain Detector 314,545 112 *
Simple Lie Detector 576,670 323
Simple Polarity Tester Dudley LeRoux 174,620 13 *
Simple Servo Controller 231,419 22 *
Simple Touch Switch NEW! 179,535 6 *
Simple Two Speed Contactor DC Motor Controller 214,862 21 *
Stepper Motor Controller 765,784 120 *
Time Delay Relay 566,897 88
Time Delay Relay II jawaharlal@excite.com 257,193 39 *
Touch Switch 299,815 51 *
Video Activated Relay 130,081 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,750 10 *
Water Detector With Sump/Bilge Pump Controller 161,910 18 *
Wire Loop Alarm Alex Meaden 214,278 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,960 25 *
12VDC To 120VAC Inverter 1,558,509 691
6V to 12V Converter 540,856 121
Automatic 12V Lead Acid Battery Charger 951,016 248
Automatic Load Sensing Power Switch 176,908 16 *
Car Battery Charger 896,069 159 *
Dual Polarity Power Supply 382,922 84 *
Fixed Voltage Power Supply 321,491 52 *
High Current Power Supply 352,892 66 *
High Voltage High Current Power Supply 274,336 35 *
LASER Power Supply 307,024 28
Portable CD Player Adapter For Car 221,569 12 *
Power Supply 751,476 259 *
Solid State Tesla Coil NEW! 158,161 4
Solid State Tesla Coil/High Voltage Generator 458,731 51
Transformerless Power Supply 474,452 117 *
Voltage Inverter 354,782 51 *
Voltage Inverter II 213,512 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,432 182
3 Watt FM Transmitter Rae XL Tkacik 350,270 83 *
50 Watt Amplifier 520,873 74
8 Note Tune Player 149,418 12 *
8 Watt Audio Amp 387,087 67 *
Aircraft Radio Communications Receiver 291,786 50 *
Crystal Radio 170,762 53 *
Digital Volume Control 350,458 47 *
Electronic Stethoscope 333,473 142 *
FET Audio Mixer 354,495 41
FM Transmitter 1,030,136 420
Guitar Fuzz Effect 259,704 54 *
Microphone Mixer Anatoly I. Shikhatov 260,933 26 *
Mono To Stereo Synthesizer oRbEq 144,620 18 *
One Tube Regenerative Radio NEW! 161,328 4 *
Op Amp Radio 402,946 80 *
Single Chip AM Radio NEW! 109,263 4 *
Single Chip FM Radio NEW! 184,486 1 *
Sound Level Meter 352,889 51 *
Stereo Tube Amplifier Weslee Kinsler 279,547 15 *
Tone Control 321,190 31
Transistor Organ 210,621 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,792 27 *
FM Telephone Bug 243,177 57
Phone Busy Indicator 222,537 24 *
Remote Telephone Ringer 126,177 3 *
Ringing Phone Light Flasher 229,648 35 *
Simple Phone Tap Derek Tombrello 392,616 98 *
Telephone Hold Button 137,237 10
Telephone Recorder 225,140 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.