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, April 01, 2026		 Stepper Motor Controller34
Electronic Stethoscope31
Yesterday
Tuesday, March 31, 2026		 Electronic Stethoscope34
12VDC To 120VAC Inverter30
Of All Time 12VDC To 120VAC Inverter1,562,195
FM Transmitter1,032,856

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,605 61 *
Car Alarm Arming Horn Beep Canceller bob 145,238 6 *
Wireless Auto Tachometer 354,130 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,264 29 *
Parallel (Printer) Port Interface 299,968 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,094 63 *
3 Channel Spectrum Analyzer 234,050 20
40W Fluorescent Lamp Inverter Bart Milnes 340,528 60 *
Adjustable Strobe Light 321,336 36
Black Light 296,107 29
Colour (Sound) Organ 303,497 36
Electronic Dice NEW! 199,886 10 *
Fantastic Atom Expander 212,162 25
Flash Slave Trigger 232,406 18 *
Infa-Red Remote Control 651,076 216 *
IR Remote Extender NEW! 143,363 3 *
IR Remote Jammer Carl 278,260 110 *
IR Remote Switch NEW! 167,622 9 *
LASER Transmitter/Receiver 430,548 92
LED Chaser 460,150 83 *
LED Metronome NEW! 109,389 3 *
LED Thermometer 216,322 22 *
Light/Dark Detector 315,850 90 *
Simple Colour Organ 146,654 11 *
Strobe Light 285,650 27 *
TRIAC Light Dimmer 566,679 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,810 122 *
Electromagnetic Levitator NEW! 154,121 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,630 214 *
AC Motor Speed Controller 407,586 29 *
Air Flow Detector 262,046 54 *
Digital Keypad Combination Lock 211,809 20
Low Voltage Alarm 239,949 58 *
Pine Racecar Victory Judge 111,496 1 *
Pulse Width Modulation DC Motor Control 668,861 94
Rain Detector 315,879 112 *
Simple Lie Detector 578,177 323
Simple Polarity Tester Dudley LeRoux 175,896 13 *
Simple Servo Controller 232,734 22 *
Simple Touch Switch NEW! 180,901 6 *
Simple Two Speed Contactor DC Motor Controller 216,171 21 *
Stepper Motor Controller 767,977 120 *
Time Delay Relay 568,370 88
Time Delay Relay II jawaharlal@excite.com 258,465 39 *
Touch Switch 301,090 51 *
Video Activated Relay 131,061 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,280 10 *
Water Detector With Sump/Bilge Pump Controller 163,255 18 *
Wire Loop Alarm Alex Meaden 215,368 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,293 25 *
12VDC To 120VAC Inverter 1,562,195 691
6V to 12V Converter 542,574 121
Automatic 12V Lead Acid Battery Charger 953,141 248
Automatic Load Sensing Power Switch 178,202 16 *
Car Battery Charger 897,748 159 *
Dual Polarity Power Supply 384,471 84 *
Fixed Voltage Power Supply 322,672 52 *
High Current Power Supply 354,511 66 *
High Voltage High Current Power Supply 275,812 35 *
LASER Power Supply 308,348 28
Portable CD Player Adapter For Car 222,801 12 *
Power Supply 753,096 259 *
Solid State Tesla Coil NEW! 159,945 4
Solid State Tesla Coil/High Voltage Generator 460,728 51
Transformerless Power Supply 475,853 117 *
Voltage Inverter 356,537 51 *
Voltage Inverter II 214,853 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,869 182
3 Watt FM Transmitter Rae XL Tkacik 351,959 83 *
50 Watt Amplifier 522,479 74
8 Note Tune Player 150,568 12 *
8 Watt Audio Amp 388,874 67 *
Aircraft Radio Communications Receiver 293,465 50 *
Crystal Radio 172,493 53 *
Digital Volume Control 351,910 47 *
Electronic Stethoscope 335,014 142 *
FET Audio Mixer 355,829 41
FM Transmitter 1,032,856 420
Guitar Fuzz Effect 261,361 54 *
Microphone Mixer Anatoly I. Shikhatov 262,306 26 *
Mono To Stereo Synthesizer oRbEq 146,002 18 *
One Tube Regenerative Radio NEW! 163,314 4 *
Op Amp Radio 404,570 80 *
Single Chip AM Radio NEW! 110,599 4 *
Single Chip FM Radio NEW! 185,982 1 *
Sound Level Meter 354,376 51 *
Stereo Tube Amplifier Weslee Kinsler 281,111 15 *
Tone Control 322,771 31
Transistor Organ 212,050 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,861 27 *
FM Telephone Bug 244,294 57
Phone Busy Indicator 223,766 24 *
Remote Telephone Ringer 127,377 3 *
Ringing Phone Light Flasher 231,320 35 *
Simple Phone Tap Derek Tombrello 393,920 98 *
Telephone Hold Button 138,381 10
Telephone Recorder 226,249 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.