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
Friday, April 24, 2026		 Phone Busy Indicator4
High Current Power Supply3
Yesterday
Thursday, April 23, 2026		 Dual Polarity Power Supply48
6V to 12V Converter45
Of All Time 12VDC To 120VAC Inverter1,563,034
FM Transmitter1,033,668

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,884 61 *
Car Alarm Arming Horn Beep Canceller bob 145,481 6 *
Wireless Auto Tachometer 354,428 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,506 29 *
Parallel (Printer) Port Interface 300,390 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,460 63 *
3 Channel Spectrum Analyzer 234,383 20
40W Fluorescent Lamp Inverter Bart Milnes 340,820 60 *
Adjustable Strobe Light 321,671 36
Black Light 296,518 29
Colour (Sound) Organ 303,847 36
Electronic Dice NEW! 200,227 10 *
Fantastic Atom Expander 212,408 25
Flash Slave Trigger 232,704 18 *
Infa-Red Remote Control 651,502 216 *
IR Remote Extender NEW! 143,667 3 *
IR Remote Jammer Carl 278,646 110 *
IR Remote Switch NEW! 167,911 9 *
LASER Transmitter/Receiver 430,924 92
LED Chaser 460,496 83 *
LED Metronome NEW! 109,722 3 *
LED Thermometer 216,598 22 *
Light/Dark Detector 316,128 90 *
Simple Colour Organ 146,943 11 *
Strobe Light 285,942 27 *
TRIAC Light Dimmer 567,073 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,212 122 *
Electromagnetic Levitator NEW! 154,450 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,233 214 *
AC Motor Speed Controller 408,045 29 *
Air Flow Detector 262,354 54 *
Digital Keypad Combination Lock 212,111 20
Low Voltage Alarm 240,262 58 *
Pine Racecar Victory Judge 111,759 1 *
Pulse Width Modulation DC Motor Control 669,238 94
Rain Detector 316,165 112 *
Simple Lie Detector 578,533 323
Simple Polarity Tester Dudley LeRoux 176,253 13 *
Simple Servo Controller 233,046 22 *
Simple Touch Switch NEW! 181,235 6 *
Simple Two Speed Contactor DC Motor Controller 216,506 21 *
Stepper Motor Controller 768,502 120 *
Time Delay Relay 568,731 88
Time Delay Relay II jawaharlal@excite.com 258,771 39 *
Touch Switch 301,397 51 *
Video Activated Relay 131,302 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,621 10 *
Water Detector With Sump/Bilge Pump Controller 163,563 18 *
Wire Loop Alarm Alex Meaden 215,665 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,839 25 *
12VDC To 120VAC Inverter 1,563,034 691
6V to 12V Converter 543,076 121
Automatic 12V Lead Acid Battery Charger 953,695 248
Automatic Load Sensing Power Switch 178,533 16 *
Car Battery Charger 898,201 159 *
Dual Polarity Power Supply 384,876 84 *
Fixed Voltage Power Supply 322,973 52 *
High Current Power Supply 354,888 66 *
High Voltage High Current Power Supply 276,151 35 *
LASER Power Supply 308,672 28
Portable CD Player Adapter For Car 223,097 12 *
Power Supply 753,538 259 *
Solid State Tesla Coil NEW! 160,402 4
Solid State Tesla Coil/High Voltage Generator 461,236 51
Transformerless Power Supply 476,156 117 *
Voltage Inverter 357,007 51 *
Voltage Inverter II 215,148 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,202 182
3 Watt FM Transmitter Rae XL Tkacik 352,399 83 *
50 Watt Amplifier 522,862 74
8 Note Tune Player 150,824 12 *
8 Watt Audio Amp 389,395 67 *
Aircraft Radio Communications Receiver 293,873 50 *
Crystal Radio 172,937 53 *
Digital Volume Control 352,232 47 *
Electronic Stethoscope 335,600 142 *
FET Audio Mixer 356,159 41
FM Transmitter 1,033,668 420
Guitar Fuzz Effect 261,794 54 *
Microphone Mixer Anatoly I. Shikhatov 262,620 26 *
Mono To Stereo Synthesizer oRbEq 146,355 18 *
One Tube Regenerative Radio NEW! 163,837 4 *
Op Amp Radio 404,981 80 *
Single Chip AM Radio NEW! 110,928 4 *
Single Chip FM Radio NEW! 186,343 1 *
Sound Level Meter 354,742 51 *
Stereo Tube Amplifier Weslee Kinsler 281,484 15 *
Tone Control 323,144 31
Transistor Organ 212,462 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,134 27 *
FM Telephone Bug 244,575 57
Phone Busy Indicator 224,100 24 *
Remote Telephone Ringer 127,672 3 *
Ringing Phone Light Flasher 231,698 35 *
Simple Phone Tap Derek Tombrello 394,202 98 *
Telephone Hold Button 138,659 10
Telephone Recorder 226,517 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.