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
Thursday, August 28, 2025		 12VDC To 120VAC Inverter54
One Tube Regenerative Radio33
Yesterday
Wednesday, August 27, 2025		 12VDC To 120VAC Inverter40
3 Watt FM Transmitter35
Of All Time 12VDC To 120VAC Inverter1,552,116
FM Transmitter1,024,962

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,245 61 *
Car Alarm Arming Horn Beep Canceller bob 142,133 6 *
Wireless Auto Tachometer 350,116 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,487 29 *
Parallel (Printer) Port Interface 295,129 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,754 63 *
3 Channel Spectrum Analyzer 230,005 20
40W Fluorescent Lamp Inverter Bart Milnes 336,745 60 *
Adjustable Strobe Light 317,303 36
Black Light 291,231 29
Colour (Sound) Organ 298,924 36
Electronic Dice NEW! 196,015 10 *
Fantastic Atom Expander 208,827 25
Flash Slave Trigger 228,450 18 *
Infa-Red Remote Control 646,489 216 *
IR Remote Extender NEW! 139,597 3 *
IR Remote Jammer Carl 274,196 110 *
IR Remote Switch NEW! 163,981 9 *
LASER Transmitter/Receiver 426,085 92
LED Chaser 455,073 83 *
LED Metronome NEW! 105,840 3 *
LED Thermometer 213,098 22 *
Light/Dark Detector 312,354 90 *
Simple Colour Organ 143,383 11 *
Strobe Light 282,221 27 *
TRIAC Light Dimmer 561,982 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,050 122 *
Electromagnetic Levitator NEW! 150,724 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,300 214 *
AC Motor Speed Controller 402,191 29 *
Air Flow Detector 258,486 54 *
Digital Keypad Combination Lock 208,295 20
Low Voltage Alarm 236,098 58 *
Pine Racecar Victory Judge 108,366 1 *
Pulse Width Modulation DC Motor Control 664,177 94
Rain Detector 311,997 112 *
Simple Lie Detector 573,540 323
Simple Polarity Tester Dudley LeRoux 171,933 13 *
Simple Servo Controller 228,836 22 *
Simple Touch Switch NEW! 176,907 6 *
Simple Two Speed Contactor DC Motor Controller 212,313 21 *
Stepper Motor Controller 761,406 120 *
Time Delay Relay 564,126 88
Time Delay Relay II jawaharlal@excite.com 254,518 39 *
Touch Switch 297,285 51 *
Video Activated Relay 127,896 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,720 10 *
Water Detector With Sump/Bilge Pump Controller 159,453 18 *
Wire Loop Alarm Alex Meaden 212,092 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 327,329 25 *
12VDC To 120VAC Inverter 1,552,116 691
6V to 12V Converter 537,607 121
Automatic 12V Lead Acid Battery Charger 947,574 248
Automatic Load Sensing Power Switch 174,435 16 *
Car Battery Charger 892,838 159 *
Dual Polarity Power Supply 379,656 84 *
Fixed Voltage Power Supply 319,094 52 *
High Current Power Supply 349,422 66 *
High Voltage High Current Power Supply 271,730 35 *
LASER Power Supply 304,531 28
Portable CD Player Adapter For Car 219,075 12 *
Power Supply 748,532 259 *
Solid State Tesla Coil NEW! 154,960 4
Solid State Tesla Coil/High Voltage Generator 455,124 51
Transformerless Power Supply 471,599 117 *
Voltage Inverter 351,045 51 *
Voltage Inverter II 211,015 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,789 182
3 Watt FM Transmitter Rae XL Tkacik 346,786 83 *
50 Watt Amplifier 517,843 74
8 Note Tune Player 147,221 12 *
8 Watt Audio Amp 383,602 67 *
Aircraft Radio Communications Receiver 288,686 50 *
Crystal Radio 167,347 53 *
Digital Volume Control 347,555 47 *
Electronic Stethoscope 330,489 142 *
FET Audio Mixer 351,974 41
FM Transmitter 1,024,962 420
Guitar Fuzz Effect 256,414 54 *
Microphone Mixer Anatoly I. Shikhatov 258,382 26 *
Mono To Stereo Synthesizer oRbEq 141,947 18 *
One Tube Regenerative Radio NEW! 157,062 4 *
Op Amp Radio 399,885 80 *
Single Chip AM Radio NEW! 106,884 4 *
Single Chip FM Radio NEW! 181,322 1 *
Sound Level Meter 350,147 51 *
Stereo Tube Amplifier Weslee Kinsler 276,326 15 *
Tone Control 318,227 31
Transistor Organ 208,022 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,697 27 *
FM Telephone Bug 241,247 57
Phone Busy Indicator 220,428 24 *
Remote Telephone Ringer 124,152 3 *
Ringing Phone Light Flasher 226,848 35 *
Simple Phone Tap Derek Tombrello 390,444 98 *
Telephone Hold Button 135,394 10
Telephone Recorder 223,124 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.