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, September 03, 2025		 Automatic Headlight Brightness Switch1
FM Telephone Bug1
Yesterday
Tuesday, September 02, 2025		 Digital Keypad Combination Lock35
7 Segment LED Counter33
Of All Time 12VDC To 120VAC Inverter1,552,311
FM Transmitter1,025,126

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,328 61 *
Car Alarm Arming Horn Beep Canceller bob 142,205 6 *
Wireless Auto Tachometer 350,191 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,548 29 *
Parallel (Printer) Port Interface 295,225 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,854 63 *
3 Channel Spectrum Analyzer 230,098 20
40W Fluorescent Lamp Inverter Bart Milnes 336,823 60 *
Adjustable Strobe Light 317,415 36
Black Light 291,339 29
Colour (Sound) Organ 299,039 36
Electronic Dice NEW! 196,094 10 *
Fantastic Atom Expander 208,895 25
Flash Slave Trigger 228,538 18 *
Infa-Red Remote Control 646,599 216 *
IR Remote Extender NEW! 139,654 3 *
IR Remote Jammer Carl 274,282 110 *
IR Remote Switch NEW! 164,066 9 *
LASER Transmitter/Receiver 426,184 92
LED Chaser 455,161 83 *
LED Metronome NEW! 105,917 3 *
LED Thermometer 213,162 22 *
Light/Dark Detector 312,432 90 *
Simple Colour Organ 143,453 11 *
Strobe Light 282,316 27 *
TRIAC Light Dimmer 562,076 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,141 122 *
Electromagnetic Levitator NEW! 150,805 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,454 214 *
AC Motor Speed Controller 402,327 29 *
Air Flow Detector 258,558 54 *
Digital Keypad Combination Lock 208,386 20
Low Voltage Alarm 236,172 58 *
Pine Racecar Victory Judge 108,446 1 *
Pulse Width Modulation DC Motor Control 664,310 94
Rain Detector 312,074 112 *
Simple Lie Detector 573,624 323
Simple Polarity Tester Dudley LeRoux 172,014 13 *
Simple Servo Controller 228,919 22 *
Simple Touch Switch NEW! 176,994 6 *
Simple Two Speed Contactor DC Motor Controller 212,403 21 *
Stepper Motor Controller 761,561 120 *
Time Delay Relay 564,223 88
Time Delay Relay II jawaharlal@excite.com 254,613 39 *
Touch Switch 297,366 51 *
Video Activated Relay 127,974 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,796 10 *
Water Detector With Sump/Bilge Pump Controller 159,522 18 *
Wire Loop Alarm Alex Meaden 212,171 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 327,479 25 *
12VDC To 120VAC Inverter 1,552,311 691
6V to 12V Converter 537,707 121
Automatic 12V Lead Acid Battery Charger 947,705 248
Automatic Load Sensing Power Switch 174,511 16 *
Car Battery Charger 892,957 159 *
Dual Polarity Power Supply 379,747 84 *
Fixed Voltage Power Supply 319,182 52 *
High Current Power Supply 349,535 66 *
High Voltage High Current Power Supply 271,809 35 *
LASER Power Supply 304,624 28
Portable CD Player Adapter For Car 219,142 12 *
Power Supply 748,629 259 *
Solid State Tesla Coil NEW! 155,052 4
Solid State Tesla Coil/High Voltage Generator 455,240 51
Transformerless Power Supply 471,687 117 *
Voltage Inverter 351,186 51 *
Voltage Inverter II 211,085 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,865 182
3 Watt FM Transmitter Rae XL Tkacik 346,907 83 *
50 Watt Amplifier 517,938 74
8 Note Tune Player 147,277 12 *
8 Watt Audio Amp 383,724 67 *
Aircraft Radio Communications Receiver 288,792 50 *
Crystal Radio 167,461 53 *
Digital Volume Control 347,644 47 *
Electronic Stethoscope 330,584 142 *
FET Audio Mixer 352,071 41
FM Transmitter 1,025,126 420
Guitar Fuzz Effect 256,532 54 *
Microphone Mixer Anatoly I. Shikhatov 258,476 26 *
Mono To Stereo Synthesizer oRbEq 142,039 18 *
One Tube Regenerative Radio NEW! 157,254 4 *
Op Amp Radio 400,004 80 *
Single Chip AM Radio NEW! 106,965 4 *
Single Chip FM Radio NEW! 181,403 1 *
Sound Level Meter 350,233 51 *
Stereo Tube Amplifier Weslee Kinsler 276,425 15 *
Tone Control 318,323 31
Transistor Organ 208,105 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,775 27 *
FM Telephone Bug 241,329 57
Phone Busy Indicator 220,497 24 *
Remote Telephone Ringer 124,211 3 *
Ringing Phone Light Flasher 226,955 35 *
Simple Phone Tap Derek Tombrello 390,526 98 *
Telephone Hold Button 135,475 10
Telephone Recorder 223,207 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.