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
Friday, June 20, 2025		 AC Motor Speed Controller17
Stepper Motor Controller15
Yesterday
Thursday, June 19, 2025		 Stepper Motor Controller50
Black Light40
Of All Time 12VDC To 120VAC Inverter1,549,113
FM Transmitter1,022,611

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,343 61 *
Car Alarm Arming Horn Beep Canceller bob 141,443 6 *
Wireless Auto Tachometer 349,164 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 164,777 29 *
Parallel (Printer) Port Interface 293,899 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 454,749 63 *
3 Channel Spectrum Analyzer 228,940 20
40W Fluorescent Lamp Inverter Bart Milnes 335,827 60 *
Adjustable Strobe Light 316,150 36
Black Light 290,053 29
Colour (Sound) Organ 297,680 36
Electronic Dice NEW! 195,058 10 *
Fantastic Atom Expander 208,086 25
Flash Slave Trigger 227,447 18 *
Infa-Red Remote Control 644,925 216 *
IR Remote Extender NEW! 138,663 3 *
IR Remote Jammer Carl 273,150 110 *
IR Remote Switch NEW! 163,018 9 *
LASER Transmitter/Receiver 424,837 92
LED Chaser 453,825 83 *
LED Metronome NEW! 104,958 3 *
LED Thermometer 212,289 22 *
Light/Dark Detector 311,530 90 *
Simple Colour Organ 142,539 11 *
Strobe Light 281,441 27 *
TRIAC Light Dimmer 560,903 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,042 122 *
Electromagnetic Levitator NEW! 149,887 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 931,876 214 *
AC Motor Speed Controller 400,667 29 *
Air Flow Detector 257,575 54 *
Digital Keypad Combination Lock 207,453 20
Low Voltage Alarm 235,050 58 *
Pine Racecar Victory Judge 107,632 1 *
Pulse Width Modulation DC Motor Control 662,747 94
Rain Detector 311,076 112 *
Simple Lie Detector 572,250 323
Simple Polarity Tester Dudley LeRoux 171,061 13 *
Simple Servo Controller 227,790 22 *
Simple Touch Switch NEW! 175,919 6 *
Simple Two Speed Contactor DC Motor Controller 211,321 21 *
Stepper Motor Controller 759,401 120 *
Time Delay Relay 562,957 88
Time Delay Relay II jawaharlal@excite.com 253,569 39 *
Touch Switch 296,178 51 *
Video Activated Relay 127,084 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 187,672 10 *
Water Detector With Sump/Bilge Pump Controller 158,596 18 *
Wire Loop Alarm Alex Meaden 211,194 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 325,733 25 *
12VDC To 120VAC Inverter 1,549,113 691
6V to 12V Converter 536,218 121
Automatic 12V Lead Acid Battery Charger 946,197 248
Automatic Load Sensing Power Switch 173,473 16 *
Car Battery Charger 891,429 159 *
Dual Polarity Power Supply 378,352 84 *
Fixed Voltage Power Supply 318,057 52 *
High Current Power Supply 348,098 66 *
High Voltage High Current Power Supply 270,623 35 *
LASER Power Supply 303,412 28
Portable CD Player Adapter For Car 218,162 12 *
Power Supply 747,389 259 *
Solid State Tesla Coil NEW! 153,648 4
Solid State Tesla Coil/High Voltage Generator 453,620 51
Transformerless Power Supply 470,459 117 *
Voltage Inverter 349,276 51 *
Voltage Inverter II 210,061 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,584 182
3 Watt FM Transmitter Rae XL Tkacik 344,833 83 *
50 Watt Amplifier 516,360 74
8 Note Tune Player 146,417 12 *
8 Watt Audio Amp 382,051 67 *
Aircraft Radio Communications Receiver 287,389 50 *
Crystal Radio 166,078 53 *
Digital Volume Control 346,341 47 *
Electronic Stethoscope 329,332 142 *
FET Audio Mixer 350,956 41
FM Transmitter 1,022,611 420
Guitar Fuzz Effect 255,209 54 *
Microphone Mixer Anatoly I. Shikhatov 257,357 26 *
Mono To Stereo Synthesizer oRbEq 140,929 18 *
One Tube Regenerative Radio NEW! 155,046 4 *
Op Amp Radio 398,486 80 *
Single Chip AM Radio NEW! 105,987 4 *
Single Chip FM Radio NEW! 180,099 1 *
Sound Level Meter 349,111 51 *
Stereo Tube Amplifier Weslee Kinsler 275,245 15 *
Tone Control 317,029 31
Transistor Organ 206,989 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 168,929 27 *
FM Telephone Bug 240,503 57
Phone Busy Indicator 219,594 24 *
Remote Telephone Ringer 123,394 3 *
Ringing Phone Light Flasher 225,626 35 *
Simple Phone Tap Derek Tombrello 389,566 98 *
Telephone Hold Button 134,531 10
Telephone Recorder 222,351 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.