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
Wednesday, December 31, 2025		 12VDC To 120VAC Inverter36
FM Transmitter34
Yesterday
Tuesday, December 30, 2025		 7 Segment LED Counter39
High Current Power Supply37
Of All Time 12VDC To 120VAC Inverter1,558,181
FM Transmitter1,029,915

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,354 61 *
Car Alarm Arming Horn Beep Canceller bob 144,109 6 *
Wireless Auto Tachometer 352,559 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,216 29 *
Parallel (Printer) Port Interface 298,310 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,502 63 *
3 Channel Spectrum Analyzer 232,564 20
40W Fluorescent Lamp Inverter Bart Milnes 339,053 60 *
Adjustable Strobe Light 319,850 36
Black Light 294,331 29
Colour (Sound) Organ 301,742 36
Electronic Dice NEW! 198,481 10 *
Fantastic Atom Expander 210,912 25
Flash Slave Trigger 230,900 18 *
Infa-Red Remote Control 649,468 216 *
IR Remote Extender NEW! 141,924 3 *
IR Remote Jammer Carl 276,803 110 *
IR Remote Switch NEW! 166,317 9 *
LASER Transmitter/Receiver 428,799 92
LED Chaser 458,339 83 *
LED Metronome NEW! 108,079 3 *
LED Thermometer 215,115 22 *
Light/Dark Detector 314,552 90 *
Simple Colour Organ 145,522 11 *
Strobe Light 284,443 27 *
TRIAC Light Dimmer 564,817 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,838 122 *
Electromagnetic Levitator NEW! 152,838 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,382 214 *
AC Motor Speed Controller 405,768 29 *
Air Flow Detector 260,685 54 *
Digital Keypad Combination Lock 210,529 20
Low Voltage Alarm 238,564 58 *
Pine Racecar Victory Judge 110,344 1 *
Pulse Width Modulation DC Motor Control 667,076 94
Rain Detector 314,422 112 *
Simple Lie Detector 576,500 323
Simple Polarity Tester Dudley LeRoux 174,502 13 *
Simple Servo Controller 231,286 22 *
Simple Touch Switch NEW! 179,395 6 *
Simple Two Speed Contactor DC Motor Controller 214,746 21 *
Stepper Motor Controller 765,600 120 *
Time Delay Relay 566,776 88
Time Delay Relay II jawaharlal@excite.com 257,047 39 *
Touch Switch 299,689 51 *
Video Activated Relay 129,984 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,576 10 *
Water Detector With Sump/Bilge Pump Controller 161,771 18 *
Wire Loop Alarm Alex Meaden 214,166 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,763 25 *
12VDC To 120VAC Inverter 1,558,181 691
6V to 12V Converter 540,681 121
Automatic 12V Lead Acid Battery Charger 950,797 248
Automatic Load Sensing Power Switch 176,770 16 *
Car Battery Charger 895,923 159 *
Dual Polarity Power Supply 382,768 84 *
Fixed Voltage Power Supply 321,384 52 *
High Current Power Supply 352,712 66 *
High Voltage High Current Power Supply 274,181 35 *
LASER Power Supply 306,917 28
Portable CD Player Adapter For Car 221,454 12 *
Power Supply 751,337 259 *
Solid State Tesla Coil NEW! 157,992 4
Solid State Tesla Coil/High Voltage Generator 458,559 51
Transformerless Power Supply 474,334 117 *
Voltage Inverter 354,637 51 *
Voltage Inverter II 213,386 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,303 182
3 Watt FM Transmitter Rae XL Tkacik 350,111 83 *
50 Watt Amplifier 520,721 74
8 Note Tune Player 149,294 12 *
8 Watt Audio Amp 386,918 67 *
Aircraft Radio Communications Receiver 291,611 50 *
Crystal Radio 170,590 53 *
Digital Volume Control 350,298 47 *
Electronic Stethoscope 333,334 142 *
FET Audio Mixer 354,381 41
FM Transmitter 1,029,915 420
Guitar Fuzz Effect 259,549 54 *
Microphone Mixer Anatoly I. Shikhatov 260,810 26 *
Mono To Stereo Synthesizer oRbEq 144,486 18 *
One Tube Regenerative Radio NEW! 161,149 4 *
Op Amp Radio 402,816 80 *
Single Chip AM Radio NEW! 109,131 4 *
Single Chip FM Radio NEW! 184,305 1 *
Sound Level Meter 352,749 51 *
Stereo Tube Amplifier Weslee Kinsler 279,381 15 *
Tone Control 321,023 31
Transistor Organ 210,473 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,690 27 *
FM Telephone Bug 243,083 57
Phone Busy Indicator 222,445 24 *
Remote Telephone Ringer 126,049 3 *
Ringing Phone Light Flasher 229,509 35 *
Simple Phone Tap Derek Tombrello 392,505 98 *
Telephone Hold Button 137,129 10
Telephone Recorder 225,039 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.