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
Monday, June 30, 2025		 12VDC To 120VAC Inverter46
FM Transmitter39
Yesterday
Sunday, June 29, 2025		 FM Transmitter62
Telephone Hold Button39
Of All Time 12VDC To 120VAC Inverter1,549,691
FM Transmitter1,023,096

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,522 61 *
Car Alarm Arming Horn Beep Canceller bob 141,544 6 *
Wireless Auto Tachometer 349,337 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 164,891 29 *
Parallel (Printer) Port Interface 294,143 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 454,943 63 *
3 Channel Spectrum Analyzer 229,140 20
40W Fluorescent Lamp Inverter Bart Milnes 336,014 60 *
Adjustable Strobe Light 316,361 36
Black Light 290,267 29
Colour (Sound) Organ 297,903 36
Electronic Dice NEW! 195,223 10 *
Fantastic Atom Expander 208,228 25
Flash Slave Trigger 227,641 18 *
Infa-Red Remote Control 645,266 216 *
IR Remote Extender NEW! 138,853 3 *
IR Remote Jammer Carl 273,303 110 *
IR Remote Switch NEW! 163,226 9 *
LASER Transmitter/Receiver 425,090 92
LED Chaser 454,097 83 *
LED Metronome NEW! 105,122 3 *
LED Thermometer 212,413 22 *
Light/Dark Detector 311,650 90 *
Simple Colour Organ 142,697 11 *
Strobe Light 281,580 27 *
TRIAC Light Dimmer 561,093 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,218 122 *
Electromagnetic Levitator NEW! 150,033 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,144 214 *
AC Motor Speed Controller 400,953 29 *
Air Flow Detector 257,738 54 *
Digital Keypad Combination Lock 207,588 20
Low Voltage Alarm 235,249 58 *
Pine Racecar Victory Judge 107,790 1 *
Pulse Width Modulation DC Motor Control 662,966 94
Rain Detector 311,265 112 *
Simple Lie Detector 572,508 323
Simple Polarity Tester Dudley LeRoux 171,213 13 *
Simple Servo Controller 227,979 22 *
Simple Touch Switch NEW! 176,055 6 *
Simple Two Speed Contactor DC Motor Controller 211,510 21 *
Stepper Motor Controller 759,737 120 *
Time Delay Relay 563,191 88
Time Delay Relay II jawaharlal@excite.com 253,746 39 *
Touch Switch 296,376 51 *
Video Activated Relay 127,251 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 187,880 10 *
Water Detector With Sump/Bilge Pump Controller 158,771 18 *
Wire Loop Alarm Alex Meaden 211,369 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 325,972 25 *
12VDC To 120VAC Inverter 1,549,691 691
6V to 12V Converter 536,511 121
Automatic 12V Lead Acid Battery Charger 946,479 248
Automatic Load Sensing Power Switch 173,660 16 *
Car Battery Charger 891,729 159 *
Dual Polarity Power Supply 378,648 84 *
Fixed Voltage Power Supply 318,261 52 *
High Current Power Supply 348,324 66 *
High Voltage High Current Power Supply 270,865 35 *
LASER Power Supply 303,654 28
Portable CD Player Adapter For Car 218,324 12 *
Power Supply 747,598 259 *
Solid State Tesla Coil NEW! 153,894 4
Solid State Tesla Coil/High Voltage Generator 453,900 51
Transformerless Power Supply 470,697 117 *
Voltage Inverter 349,546 51 *
Voltage Inverter II 210,245 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,843 182
3 Watt FM Transmitter Rae XL Tkacik 345,180 83 *
50 Watt Amplifier 516,698 74
8 Note Tune Player 146,600 12 *
8 Watt Audio Amp 382,368 67 *
Aircraft Radio Communications Receiver 287,649 50 *
Crystal Radio 166,338 53 *
Digital Volume Control 346,583 47 *
Electronic Stethoscope 329,543 142 *
FET Audio Mixer 351,180 41
FM Transmitter 1,023,096 420
Guitar Fuzz Effect 255,442 54 *
Microphone Mixer Anatoly I. Shikhatov 257,564 26 *
Mono To Stereo Synthesizer oRbEq 141,125 18 *
One Tube Regenerative Radio NEW! 155,370 4 *
Op Amp Radio 398,827 80 *
Single Chip AM Radio NEW! 106,169 4 *
Single Chip FM Radio NEW! 180,345 1 *
Sound Level Meter 349,325 51 *
Stereo Tube Amplifier Weslee Kinsler 275,421 15 *
Tone Control 317,286 31
Transistor Organ 207,223 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,039 27 *
FM Telephone Bug 240,599 57
Phone Busy Indicator 219,732 24 *
Remote Telephone Ringer 123,495 3 *
Ringing Phone Light Flasher 225,812 35 *
Simple Phone Tap Derek Tombrello 389,690 98 *
Telephone Hold Button 134,706 10
Telephone Recorder 222,448 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.