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, January 05, 2026		 Automatic 12V Lead Acid Battery Charger35
12VDC To 120VAC Inverter15
Yesterday
Sunday, January 04, 2026		 12VDC To 120VAC Inverter46
FM Transmitter38
Of All Time 12VDC To 120VAC Inverter1,558,381
FM Transmitter1,030,053

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,425 61 *
Car Alarm Arming Horn Beep Canceller bob 144,179 6 *
Wireless Auto Tachometer 352,645 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,274 29 *
Parallel (Printer) Port Interface 298,395 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,579 63 *
3 Channel Spectrum Analyzer 232,648 20
40W Fluorescent Lamp Inverter Bart Milnes 339,142 60 *
Adjustable Strobe Light 319,932 36
Black Light 294,417 29
Colour (Sound) Organ 301,831 36
Electronic Dice NEW! 198,554 10 *
Fantastic Atom Expander 210,977 25
Flash Slave Trigger 230,977 18 *
Infa-Red Remote Control 649,565 216 *
IR Remote Extender NEW! 142,014 3 *
IR Remote Jammer Carl 276,889 110 *
IR Remote Switch NEW! 166,393 9 *
LASER Transmitter/Receiver 428,860 92
LED Chaser 458,446 83 *
LED Metronome NEW! 108,144 3 *
LED Thermometer 215,177 22 *
Light/Dark Detector 314,608 90 *
Simple Colour Organ 145,572 11 *
Strobe Light 284,508 27 *
TRIAC Light Dimmer 564,900 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,903 122 *
Electromagnetic Levitator NEW! 152,906 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,494 214 *
AC Motor Speed Controller 405,868 29 *
Air Flow Detector 260,760 54 *
Digital Keypad Combination Lock 210,609 20
Low Voltage Alarm 238,647 58 *
Pine Racecar Victory Judge 110,410 1 *
Pulse Width Modulation DC Motor Control 667,190 94
Rain Detector 314,491 112 *
Simple Lie Detector 576,608 323
Simple Polarity Tester Dudley LeRoux 174,580 13 *
Simple Servo Controller 231,370 22 *
Simple Touch Switch NEW! 179,469 6 *
Simple Two Speed Contactor DC Motor Controller 214,804 21 *
Stepper Motor Controller 765,712 120 *
Time Delay Relay 566,850 88
Time Delay Relay II jawaharlal@excite.com 257,134 39 *
Touch Switch 299,763 51 *
Video Activated Relay 130,052 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,681 10 *
Water Detector With Sump/Bilge Pump Controller 161,852 18 *
Wire Loop Alarm Alex Meaden 214,235 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,891 25 *
12VDC To 120VAC Inverter 1,558,381 691
6V to 12V Converter 540,785 121
Automatic 12V Lead Acid Battery Charger 950,943 248
Automatic Load Sensing Power Switch 176,852 16 *
Car Battery Charger 896,009 159 *
Dual Polarity Power Supply 382,864 84 *
Fixed Voltage Power Supply 321,451 52 *
High Current Power Supply 352,807 66 *
High Voltage High Current Power Supply 274,278 35 *
LASER Power Supply 306,972 28
Portable CD Player Adapter For Car 221,527 12 *
Power Supply 751,414 259 *
Solid State Tesla Coil NEW! 158,091 4
Solid State Tesla Coil/High Voltage Generator 458,661 51
Transformerless Power Supply 474,414 117 *
Voltage Inverter 354,725 51 *
Voltage Inverter II 213,463 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,381 182
3 Watt FM Transmitter Rae XL Tkacik 350,206 83 *
50 Watt Amplifier 520,813 74
8 Note Tune Player 149,374 12 *
8 Watt Audio Amp 387,026 67 *
Aircraft Radio Communications Receiver 291,727 50 *
Crystal Radio 170,700 53 *
Digital Volume Control 350,395 47 *
Electronic Stethoscope 333,415 142 *
FET Audio Mixer 354,462 41
FM Transmitter 1,030,053 420
Guitar Fuzz Effect 259,639 54 *
Microphone Mixer Anatoly I. Shikhatov 260,892 26 *
Mono To Stereo Synthesizer oRbEq 144,573 18 *
One Tube Regenerative Radio NEW! 161,262 4 *
Op Amp Radio 402,907 80 *
Single Chip AM Radio NEW! 109,215 4 *
Single Chip FM Radio NEW! 184,413 1 *
Sound Level Meter 352,846 51 *
Stereo Tube Amplifier Weslee Kinsler 279,489 15 *
Tone Control 321,125 31
Transistor Organ 210,561 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,754 27 *
FM Telephone Bug 243,139 57
Phone Busy Indicator 222,502 24 *
Remote Telephone Ringer 126,135 3 *
Ringing Phone Light Flasher 229,592 35 *
Simple Phone Tap Derek Tombrello 392,577 98 *
Telephone Hold Button 137,196 10
Telephone Recorder 225,099 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.