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
Saturday, October 10, 2026		 Parallel (Printer) Port Interface32
LASER Power Supply28
Yesterday
Friday, October 09, 2026		 Black Light44
Adjustable Strobe Light42
Of All Time 12VDC To 120VAC Inverter1,570,107
FM Transmitter1,039,124

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 239,142 61 *
Car Alarm Arming Horn Beep Canceller bob 147,615 6 *
Wireless Auto Tachometer 356,929 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,749 29 *
Parallel (Printer) Port Interface 303,744 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,715 63 *
3 Channel Spectrum Analyzer 237,433 20
40W Fluorescent Lamp Inverter Bart Milnes 343,206 60 *
Adjustable Strobe Light 324,613 36
Black Light 299,897 29
Colour (Sound) Organ 306,996 36
Electronic Dice NEW! 202,935 10 *
Fantastic Atom Expander 214,822 25
Flash Slave Trigger 235,686 18 *
Infa-Red Remote Control 655,175 216 *
IR Remote Extender NEW! 146,332 3 *
IR Remote Jammer Carl 281,657 110 *
IR Remote Switch NEW! 170,465 9 *
LASER Transmitter/Receiver 433,786 92
LED Chaser 463,988 83 *
LED Metronome NEW! 112,342 3 *
LED Thermometer 218,876 22 *
Light/Dark Detector 318,492 90 *
Simple Colour Organ 149,421 11 *
Strobe Light 288,568 27 *
TRIAC Light Dimmer 570,863 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,597 122 *
Electromagnetic Levitator NEW! 156,690 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 944,208 214 *
AC Motor Speed Controller 411,152 29 *
Air Flow Detector 265,020 54 *
Digital Keypad Combination Lock 214,421 20
Low Voltage Alarm 242,852 58 *
Pine Racecar Victory Judge 114,088 1 *
Pulse Width Modulation DC Motor Control 672,449 94
Rain Detector 318,903 112 *
Simple Lie Detector 581,279 323
Simple Polarity Tester Dudley LeRoux 178,787 13 *
Simple Servo Controller 235,810 22 *
Simple Touch Switch NEW! 183,855 6 *
Simple Two Speed Contactor DC Motor Controller 219,258 21 *
Stepper Motor Controller 772,558 120 *
Time Delay Relay 571,842 88
Time Delay Relay II jawaharlal@excite.com 261,266 39 *
Touch Switch 304,200 51 *
Video Activated Relay 133,843 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 197,436 10 *
Water Detector With Sump/Bilge Pump Controller 165,905 18 *
Wire Loop Alarm Alex Meaden 218,212 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,732 25 *
12VDC To 120VAC Inverter 1,570,107 691
6V to 12V Converter 546,507 121
Automatic 12V Lead Acid Battery Charger 957,478 248
Automatic Load Sensing Power Switch 181,131 16 *
Car Battery Charger 901,189 159 *
Dual Polarity Power Supply 387,690 84 *
Fixed Voltage Power Supply 325,148 52 *
High Current Power Supply 357,685 66 *
High Voltage High Current Power Supply 278,365 35 *
LASER Power Supply 311,431 28
Portable CD Player Adapter For Car 225,637 12 *
Power Supply 756,659 259 *
Solid State Tesla Coil NEW! 163,253 4
Solid State Tesla Coil/High Voltage Generator 465,290 51
Transformerless Power Supply 478,600 117 *
Voltage Inverter 360,340 51 *
Voltage Inverter II 217,610 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,539 182
3 Watt FM Transmitter Rae XL Tkacik 355,705 83 *
50 Watt Amplifier 525,483 74
8 Note Tune Player 153,004 12 *
8 Watt Audio Amp 392,622 67 *
Aircraft Radio Communications Receiver 296,789 50 *
Crystal Radio 175,844 53 *
Digital Volume Control 354,898 47 *
Electronic Stethoscope 338,639 142 *
FET Audio Mixer 358,714 41
FM Transmitter 1,039,124 420
Guitar Fuzz Effect 264,760 54 *
Microphone Mixer Anatoly I. Shikhatov 265,032 26 *
Mono To Stereo Synthesizer oRbEq 148,914 18 *
One Tube Regenerative Radio NEW! 167,317 4 *
Op Amp Radio 408,045 80 *
Single Chip AM Radio NEW! 113,420 4 *
Single Chip FM Radio NEW! 189,544 1 *
Sound Level Meter 357,322 51 *
Stereo Tube Amplifier Weslee Kinsler 283,879 15 *
Tone Control 325,746 31
Transistor Organ 215,356 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,228 27 *
FM Telephone Bug 246,830 57
Phone Busy Indicator 226,482 24 *
Remote Telephone Ringer 129,673 3 *
Ringing Phone Light Flasher 234,516 35 *
Simple Phone Tap Derek Tombrello 396,375 98 *
Telephone Hold Button 140,594 10
Telephone Recorder 228,894 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.