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 24, 2025		 12VDC To 120VAC Inverter40
AC Motor Speed Controller32
Yesterday
Tuesday, December 23, 2025		 7 Segment LED Counter41
12VDC To 120VAC Inverter35
Of All Time 12VDC To 120VAC Inverter1,557,895
FM Transmitter1,029,705

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,255 61 *
Car Alarm Arming Horn Beep Canceller bob 144,019 6 *
Wireless Auto Tachometer 352,439 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,138 29 *
Parallel (Printer) Port Interface 298,171 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,403 63 *
3 Channel Spectrum Analyzer 232,440 20
40W Fluorescent Lamp Inverter Bart Milnes 338,936 60 *
Adjustable Strobe Light 319,732 36
Black Light 294,170 29
Colour (Sound) Organ 301,610 36
Electronic Dice NEW! 198,365 10 *
Fantastic Atom Expander 210,811 25
Flash Slave Trigger 230,747 18 *
Infa-Red Remote Control 649,356 216 *
IR Remote Extender NEW! 141,824 3 *
IR Remote Jammer Carl 276,668 110 *
IR Remote Switch NEW! 166,199 9 *
LASER Transmitter/Receiver 428,682 92
LED Chaser 458,163 83 *
LED Metronome NEW! 107,981 3 *
LED Thermometer 215,025 22 *
Light/Dark Detector 314,457 90 *
Simple Colour Organ 145,438 11 *
Strobe Light 284,334 27 *
TRIAC Light Dimmer 564,683 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,721 122 *
Electromagnetic Levitator NEW! 152,726 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,146 214 *
AC Motor Speed Controller 405,618 29 *
Air Flow Detector 260,572 54 *
Digital Keypad Combination Lock 210,421 20
Low Voltage Alarm 238,443 58 *
Pine Racecar Victory Judge 110,259 1 *
Pulse Width Modulation DC Motor Control 666,935 94
Rain Detector 314,318 112 *
Simple Lie Detector 576,332 323
Simple Polarity Tester Dudley LeRoux 174,376 13 *
Simple Servo Controller 231,160 22 *
Simple Touch Switch NEW! 179,270 6 *
Simple Two Speed Contactor DC Motor Controller 214,631 21 *
Stepper Motor Controller 765,441 120 *
Time Delay Relay 566,629 88
Time Delay Relay II jawaharlal@excite.com 256,923 39 *
Touch Switch 299,560 51 *
Video Activated Relay 129,898 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,428 10 *
Water Detector With Sump/Bilge Pump Controller 161,629 18 *
Wire Loop Alarm Alex Meaden 214,064 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,574 25 *
12VDC To 120VAC Inverter 1,557,895 691
6V to 12V Converter 540,519 121
Automatic 12V Lead Acid Battery Charger 950,638 248
Automatic Load Sensing Power Switch 176,661 16 *
Car Battery Charger 895,784 159 *
Dual Polarity Power Supply 382,621 84 *
Fixed Voltage Power Supply 321,289 52 *
High Current Power Supply 352,547 66 *
High Voltage High Current Power Supply 274,045 35 *
LASER Power Supply 306,800 28
Portable CD Player Adapter For Car 221,344 12 *
Power Supply 751,199 259 *
Solid State Tesla Coil NEW! 157,826 4
Solid State Tesla Coil/High Voltage Generator 458,367 51
Transformerless Power Supply 474,216 117 *
Voltage Inverter 354,454 51 *
Voltage Inverter II 213,277 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,152 182
3 Watt FM Transmitter Rae XL Tkacik 349,923 83 *
50 Watt Amplifier 520,576 74
8 Note Tune Player 149,174 12 *
8 Watt Audio Amp 386,766 67 *
Aircraft Radio Communications Receiver 291,459 50 *
Crystal Radio 170,424 53 *
Digital Volume Control 350,145 47 *
Electronic Stethoscope 333,189 142 *
FET Audio Mixer 354,267 41
FM Transmitter 1,029,705 420
Guitar Fuzz Effect 259,398 54 *
Microphone Mixer Anatoly I. Shikhatov 260,691 26 *
Mono To Stereo Synthesizer oRbEq 144,362 18 *
One Tube Regenerative Radio NEW! 160,961 4 *
Op Amp Radio 402,684 80 *
Single Chip AM Radio NEW! 109,012 4 *
Single Chip FM Radio NEW! 184,138 1 *
Sound Level Meter 352,616 51 *
Stereo Tube Amplifier Weslee Kinsler 279,203 15 *
Tone Control 320,882 31
Transistor Organ 210,358 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,587 27 *
FM Telephone Bug 242,992 57
Phone Busy Indicator 222,341 24 *
Remote Telephone Ringer 125,930 3 *
Ringing Phone Light Flasher 229,373 35 *
Simple Phone Tap Derek Tombrello 392,402 98 *
Telephone Hold Button 137,032 10
Telephone Recorder 224,930 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.