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
Thursday, June 11, 2026		 FM Transmitter14
Wireless Auto Tachometer12
Yesterday
Wednesday, June 10, 2026		 12VDC To 120VAC Inverter37
High Current Power Supply32
Of All Time 12VDC To 120VAC Inverter1,564,829
FM Transmitter1,035,772

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,417 61 *
Car Alarm Arming Horn Beep Canceller bob 146,010 6 *
Wireless Auto Tachometer 354,986 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,010 29 *
Parallel (Printer) Port Interface 301,109 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,224 63 *
3 Channel Spectrum Analyzer 235,137 20
40W Fluorescent Lamp Inverter Bart Milnes 341,406 60 *
Adjustable Strobe Light 322,330 36
Black Light 297,304 29
Colour (Sound) Organ 304,563 36
Electronic Dice NEW! 200,883 10 *
Fantastic Atom Expander 212,966 25
Flash Slave Trigger 233,265 18 *
Infa-Red Remote Control 652,263 216 *
IR Remote Extender NEW! 144,233 3 *
IR Remote Jammer Carl 279,299 110 *
IR Remote Switch NEW! 168,502 9 *
LASER Transmitter/Receiver 431,632 92
LED Chaser 461,169 83 *
LED Metronome NEW! 110,373 3 *
LED Thermometer 217,097 22 *
Light/Dark Detector 316,636 90 *
Simple Colour Organ 147,474 11 *
Strobe Light 286,502 27 *
TRIAC Light Dimmer 568,004 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 374,042 122 *
Electromagnetic Levitator NEW! 154,966 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,212 214 *
AC Motor Speed Controller 408,804 29 *
Air Flow Detector 263,020 54 *
Digital Keypad Combination Lock 212,649 20
Low Voltage Alarm 240,836 58 *
Pine Racecar Victory Judge 112,234 1 *
Pulse Width Modulation DC Motor Control 669,960 94
Rain Detector 316,732 112 *
Simple Lie Detector 579,192 323
Simple Polarity Tester Dudley LeRoux 176,861 13 *
Simple Servo Controller 233,635 22 *
Simple Touch Switch NEW! 181,811 6 *
Simple Two Speed Contactor DC Motor Controller 217,140 21 *
Stepper Motor Controller 769,508 120 *
Time Delay Relay 569,402 88
Time Delay Relay II jawaharlal@excite.com 259,339 39 *
Touch Switch 302,008 51 *
Video Activated Relay 131,819 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,335 10 *
Water Detector With Sump/Bilge Pump Controller 164,081 18 *
Wire Loop Alarm Alex Meaden 216,208 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,691 25 *
12VDC To 120VAC Inverter 1,564,829 691
6V to 12V Converter 543,833 121
Automatic 12V Lead Acid Battery Charger 954,574 248
Automatic Load Sensing Power Switch 179,102 16 *
Car Battery Charger 898,933 159 *
Dual Polarity Power Supply 385,583 84 *
Fixed Voltage Power Supply 323,538 52 *
High Current Power Supply 355,644 66 *
High Voltage High Current Power Supply 276,753 35 *
LASER Power Supply 309,345 28
Portable CD Player Adapter For Car 223,662 12 *
Power Supply 754,366 259 *
Solid State Tesla Coil NEW! 161,131 4
Solid State Tesla Coil/High Voltage Generator 462,228 51
Transformerless Power Supply 476,783 117 *
Voltage Inverter 357,861 51 *
Voltage Inverter II 215,792 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,770 182
3 Watt FM Transmitter Rae XL Tkacik 353,125 83 *
50 Watt Amplifier 523,507 74
8 Note Tune Player 151,367 12 *
8 Watt Audio Amp 390,238 67 *
Aircraft Radio Communications Receiver 294,668 50 *
Crystal Radio 173,798 53 *
Digital Volume Control 352,862 47 *
Electronic Stethoscope 336,485 142 *
FET Audio Mixer 356,817 41
FM Transmitter 1,035,772 420
Guitar Fuzz Effect 262,543 54 *
Microphone Mixer Anatoly I. Shikhatov 263,245 26 *
Mono To Stereo Synthesizer oRbEq 147,082 18 *
One Tube Regenerative Radio NEW! 164,790 4 *
Op Amp Radio 405,791 80 *
Single Chip AM Radio NEW! 111,470 4 *
Single Chip FM Radio NEW! 187,065 1 *
Sound Level Meter 355,390 51 *
Stereo Tube Amplifier Weslee Kinsler 282,156 15 *
Tone Control 323,755 31
Transistor Organ 213,136 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,643 27 *
FM Telephone Bug 245,147 57
Phone Busy Indicator 224,700 24 *
Remote Telephone Ringer 128,148 3 *
Ringing Phone Light Flasher 232,448 35 *
Simple Phone Tap Derek Tombrello 394,759 98 *
Telephone Hold Button 139,186 10
Telephone Recorder 227,052 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.