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 11, 2025		 AC Motor Speed Controller14
Solid State Tesla Coil/High Voltage Generator14
Yesterday
Friday, October 10, 2025		 12V To 24V DC-DC Converter38
7 Segment LED Counter26
Of All Time 12VDC To 120VAC Inverter1,554,215
FM Transmitter1,026,657

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,054 61 *
Car Alarm Arming Horn Beep Canceller bob 142,802 6 *
Wireless Auto Tachometer 350,977 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,129 29 *
Parallel (Printer) Port Interface 296,474 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,792 63 *
3 Channel Spectrum Analyzer 230,997 20
40W Fluorescent Lamp Inverter Bart Milnes 337,655 60 *
Adjustable Strobe Light 318,302 36
Black Light 292,331 29
Colour (Sound) Organ 299,993 36
Electronic Dice NEW! 196,906 10 *
Fantastic Atom Expander 209,588 25
Flash Slave Trigger 229,355 18 *
Infa-Red Remote Control 647,585 216 *
IR Remote Extender NEW! 140,475 3 *
IR Remote Jammer Carl 275,164 110 *
IR Remote Switch NEW! 164,813 9 *
LASER Transmitter/Receiver 427,074 92
LED Chaser 456,370 83 *
LED Metronome NEW! 106,637 3 *
LED Thermometer 213,865 22 *
Light/Dark Detector 313,202 90 *
Simple Colour Organ 144,164 11 *
Strobe Light 283,096 27 *
TRIAC Light Dimmer 562,989 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,200 122 *
Electromagnetic Levitator NEW! 151,507 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,598 214 *
AC Motor Speed Controller 403,598 29 *
Air Flow Detector 259,263 54 *
Digital Keypad Combination Lock 209,100 20
Low Voltage Alarm 236,971 58 *
Pine Racecar Victory Judge 109,084 1 *
Pulse Width Modulation DC Motor Control 665,255 94
Rain Detector 312,816 112 *
Simple Lie Detector 574,662 323
Simple Polarity Tester Dudley LeRoux 172,749 13 *
Simple Servo Controller 229,790 22 *
Simple Touch Switch NEW! 177,830 6 *
Simple Two Speed Contactor DC Motor Controller 213,197 21 *
Stepper Motor Controller 763,043 120 *
Time Delay Relay 565,108 88
Time Delay Relay II jawaharlal@excite.com 255,397 39 *
Touch Switch 298,164 51 *
Video Activated Relay 128,657 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,654 10 *
Water Detector With Sump/Bilge Pump Controller 160,178 18 *
Wire Loop Alarm Alex Meaden 212,875 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,087 25 *
12VDC To 120VAC Inverter 1,554,215 691
6V to 12V Converter 538,697 121
Automatic 12V Lead Acid Battery Charger 948,724 248
Automatic Load Sensing Power Switch 175,286 16 *
Car Battery Charger 894,002 159 *
Dual Polarity Power Supply 380,712 84 *
Fixed Voltage Power Supply 319,939 52 *
High Current Power Supply 350,645 66 *
High Voltage High Current Power Supply 272,588 35 *
LASER Power Supply 305,381 28
Portable CD Player Adapter For Car 219,873 12 *
Power Supply 749,562 259 *
Solid State Tesla Coil NEW! 156,029 4
Solid State Tesla Coil/High Voltage Generator 456,338 51
Transformerless Power Supply 472,483 117 *
Voltage Inverter 352,301 51 *
Voltage Inverter II 211,806 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,717 182
3 Watt FM Transmitter Rae XL Tkacik 347,979 83 *
50 Watt Amplifier 518,900 74
8 Note Tune Player 147,935 12 *
8 Watt Audio Amp 384,968 67 *
Aircraft Radio Communications Receiver 289,848 50 *
Crystal Radio 168,569 53 *
Digital Volume Control 348,480 47 *
Electronic Stethoscope 331,573 142 *
FET Audio Mixer 352,902 41
FM Transmitter 1,026,657 420
Guitar Fuzz Effect 257,484 54 *
Microphone Mixer Anatoly I. Shikhatov 259,314 26 *
Mono To Stereo Synthesizer oRbEq 142,842 18 *
One Tube Regenerative Radio NEW! 158,583 4 *
Op Amp Radio 400,990 80 *
Single Chip AM Radio NEW! 107,687 4 *
Single Chip FM Radio NEW! 182,407 1 *
Sound Level Meter 351,096 51 *
Stereo Tube Amplifier Weslee Kinsler 277,406 15 *
Tone Control 319,265 31
Transistor Organ 208,898 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,419 27 *
FM Telephone Bug 242,033 57
Phone Busy Indicator 221,219 24 *
Remote Telephone Ringer 124,849 3 *
Ringing Phone Light Flasher 227,924 35 *
Simple Phone Tap Derek Tombrello 391,295 98 *
Telephone Hold Button 136,113 10
Telephone Recorder 223,921 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.