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, July 16, 2025		 Pulse Width Modulation DC Motor Control37
One Tube Regenerative Radio28
Yesterday
Tuesday, July 15, 2025		 12VDC To 120VAC Inverter38
One Tube Regenerative Radio30
Of All Time 12VDC To 120VAC Inverter1,550,424
FM Transmitter1,023,603

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,727 61 *
Car Alarm Arming Horn Beep Canceller bob 141,722 6 *
Wireless Auto Tachometer 349,569 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,077 29 *
Parallel (Printer) Port Interface 294,433 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,176 63 *
3 Channel Spectrum Analyzer 229,387 20
40W Fluorescent Lamp Inverter Bart Milnes 336,228 60 *
Adjustable Strobe Light 316,637 36
Black Light 290,547 29
Colour (Sound) Organ 298,144 36
Electronic Dice NEW! 195,461 10 *
Fantastic Atom Expander 208,380 25
Flash Slave Trigger 227,893 18 *
Infa-Red Remote Control 645,770 216 *
IR Remote Extender NEW! 139,076 3 *
IR Remote Jammer Carl 273,565 110 *
IR Remote Switch NEW! 163,441 9 *
LASER Transmitter/Receiver 425,402 92
LED Chaser 454,391 83 *
LED Metronome NEW! 105,325 3 *
LED Thermometer 212,596 22 *
Light/Dark Detector 311,843 90 *
Simple Colour Organ 142,897 11 *
Strobe Light 281,752 27 *
TRIAC Light Dimmer 561,350 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,467 122 *
Electromagnetic Levitator NEW! 150,231 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,449 214 *
AC Motor Speed Controller 401,302 29 *
Air Flow Detector 257,965 54 *
Digital Keypad Combination Lock 207,786 20
Low Voltage Alarm 235,497 58 *
Pine Racecar Victory Judge 107,951 1 *
Pulse Width Modulation DC Motor Control 663,324 94
Rain Detector 311,480 112 *
Simple Lie Detector 572,820 323
Simple Polarity Tester Dudley LeRoux 171,418 13 *
Simple Servo Controller 228,227 22 *
Simple Touch Switch NEW! 176,293 6 *
Simple Two Speed Contactor DC Motor Controller 211,739 21 *
Stepper Motor Controller 760,196 120 *
Time Delay Relay 563,474 88
Time Delay Relay II jawaharlal@excite.com 253,980 39 *
Touch Switch 296,666 51 *
Video Activated Relay 127,440 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,145 10 *
Water Detector With Sump/Bilge Pump Controller 158,967 18 *
Wire Loop Alarm Alex Meaden 211,575 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,339 25 *
12VDC To 120VAC Inverter 1,550,424 691
6V to 12V Converter 536,821 121
Automatic 12V Lead Acid Battery Charger 946,819 248
Automatic Load Sensing Power Switch 173,876 16 *
Car Battery Charger 892,095 159 *
Dual Polarity Power Supply 378,949 84 *
Fixed Voltage Power Supply 318,508 52 *
High Current Power Supply 348,645 66 *
High Voltage High Current Power Supply 271,120 35 *
LASER Power Supply 303,900 28
Portable CD Player Adapter For Car 218,544 12 *
Power Supply 747,856 259 *
Solid State Tesla Coil NEW! 154,183 4
Solid State Tesla Coil/High Voltage Generator 454,256 51
Transformerless Power Supply 470,958 117 *
Voltage Inverter 350,003 51 *
Voltage Inverter II 210,464 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,092 182
3 Watt FM Transmitter Rae XL Tkacik 345,522 83 *
50 Watt Amplifier 517,034 74
8 Note Tune Player 146,791 12 *
8 Watt Audio Amp 382,728 67 *
Aircraft Radio Communications Receiver 287,940 50 *
Crystal Radio 166,630 53 *
Digital Volume Control 346,879 47 *
Electronic Stethoscope 329,842 142 *
FET Audio Mixer 351,412 41
FM Transmitter 1,023,603 420
Guitar Fuzz Effect 255,729 54 *
Microphone Mixer Anatoly I. Shikhatov 257,802 26 *
Mono To Stereo Synthesizer oRbEq 141,376 18 *
One Tube Regenerative Radio NEW! 155,842 4 *
Op Amp Radio 399,135 80 *
Single Chip AM Radio NEW! 106,368 4 *
Single Chip FM Radio NEW! 180,629 1 *
Sound Level Meter 349,585 51 *
Stereo Tube Amplifier Weslee Kinsler 275,667 15 *
Tone Control 317,569 31
Transistor Organ 207,428 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,237 27 *
FM Telephone Bug 240,777 57
Phone Busy Indicator 219,946 24 *
Remote Telephone Ringer 123,693 3 *
Ringing Phone Light Flasher 226,054 35 *
Simple Phone Tap Derek Tombrello 389,900 98 *
Telephone Hold Button 134,908 10
Telephone Recorder 222,641 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.