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
Sunday, May 31, 2026		 Automatic 12V Lead Acid Battery Charger11
Solid State Tesla Coil/High Voltage Generator11
Yesterday
Saturday, May 30, 2026		 12VDC To 120VAC Inverter50
TRIAC Light Dimmer26
Of All Time 12VDC To 120VAC Inverter1,564,471
FM Transmitter1,035,540

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,296 61 *
Car Alarm Arming Horn Beep Canceller bob 145,900 6 *
Wireless Auto Tachometer 354,848 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,898 29 *
Parallel (Printer) Port Interface 300,948 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,008 63 *
3 Channel Spectrum Analyzer 234,986 20
40W Fluorescent Lamp Inverter Bart Milnes 341,266 60 *
Adjustable Strobe Light 322,183 36
Black Light 297,115 29
Colour (Sound) Organ 304,422 36
Electronic Dice NEW! 200,733 10 *
Fantastic Atom Expander 212,837 25
Flash Slave Trigger 233,157 18 *
Infa-Red Remote Control 652,108 216 *
IR Remote Extender NEW! 144,101 3 *
IR Remote Jammer Carl 279,142 110 *
IR Remote Switch NEW! 168,359 9 *
LASER Transmitter/Receiver 431,459 92
LED Chaser 461,037 83 *
LED Metronome NEW! 110,219 3 *
LED Thermometer 216,993 22 *
Light/Dark Detector 316,511 90 *
Simple Colour Organ 147,360 11 *
Strobe Light 286,374 27 *
TRIAC Light Dimmer 567,811 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,841 122 *
Electromagnetic Levitator NEW! 154,870 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,039 214 *
AC Motor Speed Controller 408,622 29 *
Air Flow Detector 262,877 54 *
Digital Keypad Combination Lock 212,518 20
Low Voltage Alarm 240,697 58 *
Pine Racecar Victory Judge 112,123 1 *
Pulse Width Modulation DC Motor Control 669,795 94
Rain Detector 316,586 112 *
Simple Lie Detector 579,052 323
Simple Polarity Tester Dudley LeRoux 176,728 13 *
Simple Servo Controller 233,509 22 *
Simple Touch Switch NEW! 181,683 6 *
Simple Two Speed Contactor DC Motor Controller 216,985 21 *
Stepper Motor Controller 769,328 120 *
Time Delay Relay 569,253 88
Time Delay Relay II jawaharlal@excite.com 259,221 39 *
Touch Switch 301,854 51 *
Video Activated Relay 131,697 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,196 10 *
Water Detector With Sump/Bilge Pump Controller 163,962 18 *
Wire Loop Alarm Alex Meaden 216,077 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,526 25 *
12VDC To 120VAC Inverter 1,564,471 691
6V to 12V Converter 543,666 121
Automatic 12V Lead Acid Battery Charger 954,400 248
Automatic Load Sensing Power Switch 178,985 16 *
Car Battery Charger 898,764 159 *
Dual Polarity Power Supply 385,455 84 *
Fixed Voltage Power Supply 323,424 52 *
High Current Power Supply 355,465 66 *
High Voltage High Current Power Supply 276,613 35 *
LASER Power Supply 309,192 28
Portable CD Player Adapter For Car 223,527 12 *
Power Supply 754,203 259 *
Solid State Tesla Coil NEW! 161,003 4
Solid State Tesla Coil/High Voltage Generator 462,051 51
Transformerless Power Supply 476,640 117 *
Voltage Inverter 357,669 51 *
Voltage Inverter II 215,654 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,644 182
3 Watt FM Transmitter Rae XL Tkacik 352,991 83 *
50 Watt Amplifier 523,392 74
8 Note Tune Player 151,249 12 *
8 Watt Audio Amp 390,080 67 *
Aircraft Radio Communications Receiver 294,509 50 *
Crystal Radio 173,554 53 *
Digital Volume Control 352,724 47 *
Electronic Stethoscope 336,345 142 *
FET Audio Mixer 356,682 41
FM Transmitter 1,035,540 420
Guitar Fuzz Effect 262,389 54 *
Microphone Mixer Anatoly I. Shikhatov 263,133 26 *
Mono To Stereo Synthesizer oRbEq 146,973 18 *
One Tube Regenerative Radio NEW! 164,621 4 *
Op Amp Radio 405,633 80 *
Single Chip AM Radio NEW! 111,370 4 *
Single Chip FM Radio NEW! 186,911 1 *
Sound Level Meter 355,266 51 *
Stereo Tube Amplifier Weslee Kinsler 282,005 15 *
Tone Control 323,611 31
Transistor Organ 212,997 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,507 27 *
FM Telephone Bug 245,002 57
Phone Busy Indicator 224,567 24 *
Remote Telephone Ringer 128,024 3 *
Ringing Phone Light Flasher 232,279 35 *
Simple Phone Tap Derek Tombrello 394,633 98 *
Telephone Hold Button 139,063 10
Telephone Recorder 226,912 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.