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, October 06, 2025		 FM Transmitter2
Mono To Stereo Synthesizer1
Yesterday
Sunday, October 05, 2025		 12VDC To 120VAC Inverter34
12V To 24V DC-DC Converter33
Of All Time 12VDC To 120VAC Inverter1,554,014
FM Transmitter1,026,498

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,996 61 *
Car Alarm Arming Horn Beep Canceller bob 142,752 6 *
Wireless Auto Tachometer 350,907 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,081 29 *
Parallel (Printer) Port Interface 296,253 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,704 63 *
3 Channel Spectrum Analyzer 230,900 20
40W Fluorescent Lamp Inverter Bart Milnes 337,566 60 *
Adjustable Strobe Light 318,223 36
Black Light 292,248 29
Colour (Sound) Organ 299,915 36
Electronic Dice NEW! 196,835 10 *
Fantastic Atom Expander 209,538 25
Flash Slave Trigger 229,291 18 *
Infa-Red Remote Control 647,493 216 *
IR Remote Extender NEW! 140,393 3 *
IR Remote Jammer Carl 275,063 110 *
IR Remote Switch NEW! 164,758 9 *
LASER Transmitter/Receiver 427,011 92
LED Chaser 456,281 83 *
LED Metronome NEW! 106,572 3 *
LED Thermometer 213,825 22 *
Light/Dark Detector 313,140 90 *
Simple Colour Organ 144,102 11 *
Strobe Light 283,046 27 *
TRIAC Light Dimmer 562,919 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,995 122 *
Electromagnetic Levitator NEW! 151,440 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,479 214 *
AC Motor Speed Controller 403,473 29 *
Air Flow Detector 259,217 54 *
Digital Keypad Combination Lock 209,054 20
Low Voltage Alarm 236,905 58 *
Pine Racecar Victory Judge 109,037 1 *
Pulse Width Modulation DC Motor Control 665,188 94
Rain Detector 312,764 112 *
Simple Lie Detector 574,564 323
Simple Polarity Tester Dudley LeRoux 172,694 13 *
Simple Servo Controller 229,719 22 *
Simple Touch Switch NEW! 177,755 6 *
Simple Two Speed Contactor DC Motor Controller 213,138 21 *
Stepper Motor Controller 762,891 120 *
Time Delay Relay 565,034 88
Time Delay Relay II jawaharlal@excite.com 255,337 39 *
Touch Switch 298,104 51 *
Video Activated Relay 128,617 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,586 10 *
Water Detector With Sump/Bilge Pump Controller 160,124 18 *
Wire Loop Alarm Alex Meaden 212,824 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 328,785 25 *
12VDC To 120VAC Inverter 1,554,014 691
6V to 12V Converter 538,590 121
Automatic 12V Lead Acid Battery Charger 948,632 248
Automatic Load Sensing Power Switch 175,222 16 *
Car Battery Charger 893,903 159 *
Dual Polarity Power Supply 380,619 84 *
Fixed Voltage Power Supply 319,877 52 *
High Current Power Supply 350,546 66 *
High Voltage High Current Power Supply 272,528 35 *
LASER Power Supply 305,322 28
Portable CD Player Adapter For Car 219,822 12 *
Power Supply 749,498 259 *
Solid State Tesla Coil NEW! 155,938 4
Solid State Tesla Coil/High Voltage Generator 456,227 51
Transformerless Power Supply 472,424 117 *
Voltage Inverter 352,198 51 *
Voltage Inverter II 211,744 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,647 182
3 Watt FM Transmitter Rae XL Tkacik 347,845 83 *
50 Watt Amplifier 518,820 74
8 Note Tune Player 147,881 12 *
8 Watt Audio Amp 384,861 67 *
Aircraft Radio Communications Receiver 289,767 50 *
Crystal Radio 168,455 53 *
Digital Volume Control 348,408 47 *
Electronic Stethoscope 331,486 142 *
FET Audio Mixer 352,845 41
FM Transmitter 1,026,498 420
Guitar Fuzz Effect 257,390 54 *
Microphone Mixer Anatoly I. Shikhatov 259,245 26 *
Mono To Stereo Synthesizer oRbEq 142,772 18 *
One Tube Regenerative Radio NEW! 158,437 4 *
Op Amp Radio 400,888 80 *
Single Chip AM Radio NEW! 107,634 4 *
Single Chip FM Radio NEW! 182,277 1 *
Sound Level Meter 351,018 51 *
Stereo Tube Amplifier Weslee Kinsler 277,310 15 *
Tone Control 319,178 31
Transistor Organ 208,823 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,373 27 *
FM Telephone Bug 241,985 57
Phone Busy Indicator 221,149 24 *
Remote Telephone Ringer 124,796 3 *
Ringing Phone Light Flasher 227,832 35 *
Simple Phone Tap Derek Tombrello 391,233 98 *
Telephone Hold Button 136,064 10
Telephone Recorder 223,864 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.