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, June 02, 2026		 LED Chaser4
Op Amp Radio4
Yesterday
Monday, June 01, 2026		 12VDC To 120VAC Inverter34
High Voltage High Current Power Supply26
Of All Time 12VDC To 120VAC Inverter1,564,528
FM Transmitter1,035,574

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,319 61 *
Car Alarm Arming Horn Beep Canceller bob 145,914 6 *
Wireless Auto Tachometer 354,870 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,916 29 *
Parallel (Printer) Port Interface 300,965 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,042 63 *
3 Channel Spectrum Analyzer 235,011 20
40W Fluorescent Lamp Inverter Bart Milnes 341,281 60 *
Adjustable Strobe Light 322,206 36
Black Light 297,135 29
Colour (Sound) Organ 304,442 36
Electronic Dice NEW! 200,749 10 *
Fantastic Atom Expander 212,860 25
Flash Slave Trigger 233,168 18 *
Infa-Red Remote Control 652,132 216 *
IR Remote Extender NEW! 144,115 3 *
IR Remote Jammer Carl 279,169 110 *
IR Remote Switch NEW! 168,381 9 *
LASER Transmitter/Receiver 431,481 92
LED Chaser 461,059 83 *
LED Metronome NEW! 110,238 3 *
LED Thermometer 217,005 22 *
Light/Dark Detector 316,529 90 *
Simple Colour Organ 147,379 11 *
Strobe Light 286,392 27 *
TRIAC Light Dimmer 567,839 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,872 122 *
Electromagnetic Levitator NEW! 154,879 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,061 214 *
AC Motor Speed Controller 408,643 29 *
Air Flow Detector 262,899 54 *
Digital Keypad Combination Lock 212,544 20
Low Voltage Alarm 240,724 58 *
Pine Racecar Victory Judge 112,146 1 *
Pulse Width Modulation DC Motor Control 669,824 94
Rain Detector 316,609 112 *
Simple Lie Detector 579,072 323
Simple Polarity Tester Dudley LeRoux 176,747 13 *
Simple Servo Controller 233,540 22 *
Simple Touch Switch NEW! 181,699 6 *
Simple Two Speed Contactor DC Motor Controller 217,010 21 *
Stepper Motor Controller 769,360 120 *
Time Delay Relay 569,271 88
Time Delay Relay II jawaharlal@excite.com 259,238 39 *
Touch Switch 301,874 51 *
Video Activated Relay 131,720 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,215 10 *
Water Detector With Sump/Bilge Pump Controller 163,976 18 *
Wire Loop Alarm Alex Meaden 216,083 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,556 25 *
12VDC To 120VAC Inverter 1,564,528 691
6V to 12V Converter 543,683 121
Automatic 12V Lead Acid Battery Charger 954,418 248
Automatic Load Sensing Power Switch 179,004 16 *
Car Battery Charger 898,790 159 *
Dual Polarity Power Supply 385,479 84 *
Fixed Voltage Power Supply 323,447 52 *
High Current Power Supply 355,484 66 *
High Voltage High Current Power Supply 276,654 35 *
LASER Power Supply 309,205 28
Portable CD Player Adapter For Car 223,543 12 *
Power Supply 754,224 259 *
Solid State Tesla Coil NEW! 161,020 4
Solid State Tesla Coil/High Voltage Generator 462,077 51
Transformerless Power Supply 476,663 117 *
Voltage Inverter 357,696 51 *
Voltage Inverter II 215,673 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,667 182
3 Watt FM Transmitter Rae XL Tkacik 353,008 83 *
50 Watt Amplifier 523,408 74
8 Note Tune Player 151,266 12 *
8 Watt Audio Amp 390,108 67 *
Aircraft Radio Communications Receiver 294,546 50 *
Crystal Radio 173,574 53 *
Digital Volume Control 352,746 47 *
Electronic Stethoscope 336,361 142 *
FET Audio Mixer 356,706 41
FM Transmitter 1,035,574 420
Guitar Fuzz Effect 262,422 54 *
Microphone Mixer Anatoly I. Shikhatov 263,145 26 *
Mono To Stereo Synthesizer oRbEq 146,978 18 *
One Tube Regenerative Radio NEW! 164,642 4 *
Op Amp Radio 405,659 80 *
Single Chip AM Radio NEW! 111,386 4 *
Single Chip FM Radio NEW! 186,934 1 *
Sound Level Meter 355,285 51 *
Stereo Tube Amplifier Weslee Kinsler 282,021 15 *
Tone Control 323,628 31
Transistor Organ 213,016 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,517 27 *
FM Telephone Bug 245,021 57
Phone Busy Indicator 224,585 24 *
Remote Telephone Ringer 128,032 3 *
Ringing Phone Light Flasher 232,308 35 *
Simple Phone Tap Derek Tombrello 394,648 98 *
Telephone Hold Button 139,083 10
Telephone Recorder 226,929 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.