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, December 19, 2025		 Simple Servo Controller12
Ringing Phone Light Flasher8
Yesterday
Thursday, December 18, 2025		 Stereo Tube Amplifier47
7 Segment LED Counter47
Of All Time 12VDC To 120VAC Inverter1,557,663
FM Transmitter1,029,560

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,191 61 *
Car Alarm Arming Horn Beep Canceller bob 143,957 6 *
Wireless Auto Tachometer 352,370 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,084 29 *
Parallel (Printer) Port Interface 298,074 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,316 63 *
3 Channel Spectrum Analyzer 232,358 20
40W Fluorescent Lamp Inverter Bart Milnes 338,854 60 *
Adjustable Strobe Light 319,642 36
Black Light 294,077 29
Colour (Sound) Organ 301,518 36
Electronic Dice NEW! 198,290 10 *
Fantastic Atom Expander 210,744 25
Flash Slave Trigger 230,670 18 *
Infa-Red Remote Control 649,271 216 *
IR Remote Extender NEW! 141,750 3 *
IR Remote Jammer Carl 276,584 110 *
IR Remote Switch NEW! 166,127 9 *
LASER Transmitter/Receiver 428,615 92
LED Chaser 458,051 83 *
LED Metronome NEW! 107,910 3 *
LED Thermometer 214,976 22 *
Light/Dark Detector 314,386 90 *
Simple Colour Organ 145,373 11 *
Strobe Light 284,276 27 *
TRIAC Light Dimmer 564,587 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,625 122 *
Electromagnetic Levitator NEW! 152,655 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,970 214 *
AC Motor Speed Controller 405,490 29 *
Air Flow Detector 260,493 54 *
Digital Keypad Combination Lock 210,348 20
Low Voltage Alarm 238,345 58 *
Pine Racecar Victory Judge 110,203 1 *
Pulse Width Modulation DC Motor Control 666,843 94
Rain Detector 314,235 112 *
Simple Lie Detector 576,224 323
Simple Polarity Tester Dudley LeRoux 174,296 13 *
Simple Servo Controller 231,076 22 *
Simple Touch Switch NEW! 179,192 6 *
Simple Two Speed Contactor DC Motor Controller 214,555 21 *
Stepper Motor Controller 765,314 120 *
Time Delay Relay 566,529 88
Time Delay Relay II jawaharlal@excite.com 256,846 39 *
Touch Switch 299,485 51 *
Video Activated Relay 129,851 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,328 10 *
Water Detector With Sump/Bilge Pump Controller 161,547 18 *
Wire Loop Alarm Alex Meaden 213,993 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,440 25 *
12VDC To 120VAC Inverter 1,557,663 691
6V to 12V Converter 540,417 121
Automatic 12V Lead Acid Battery Charger 950,515 248
Automatic Load Sensing Power Switch 176,595 16 *
Car Battery Charger 895,706 159 *
Dual Polarity Power Supply 382,515 84 *
Fixed Voltage Power Supply 321,208 52 *
High Current Power Supply 352,464 66 *
High Voltage High Current Power Supply 273,967 35 *
LASER Power Supply 306,718 28
Portable CD Player Adapter For Car 221,251 12 *
Power Supply 751,101 259 *
Solid State Tesla Coil NEW! 157,696 4
Solid State Tesla Coil/High Voltage Generator 458,207 51
Transformerless Power Supply 474,119 117 *
Voltage Inverter 354,323 51 *
Voltage Inverter II 213,185 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,064 182
3 Watt FM Transmitter Rae XL Tkacik 349,789 83 *
50 Watt Amplifier 520,480 74
8 Note Tune Player 149,117 12 *
8 Watt Audio Amp 386,659 67 *
Aircraft Radio Communications Receiver 291,334 50 *
Crystal Radio 170,295 53 *
Digital Volume Control 350,045 47 *
Electronic Stethoscope 333,106 142 *
FET Audio Mixer 354,184 41
FM Transmitter 1,029,560 420
Guitar Fuzz Effect 259,305 54 *
Microphone Mixer Anatoly I. Shikhatov 260,610 26 *
Mono To Stereo Synthesizer oRbEq 144,288 18 *
One Tube Regenerative Radio NEW! 160,794 4 *
Op Amp Radio 402,594 80 *
Single Chip AM Radio NEW! 108,927 4 *
Single Chip FM Radio NEW! 183,987 1 *
Sound Level Meter 352,543 51 *
Stereo Tube Amplifier Weslee Kinsler 279,111 15 *
Tone Control 320,786 31
Transistor Organ 210,278 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,513 27 *
FM Telephone Bug 242,922 57
Phone Busy Indicator 222,265 24 *
Remote Telephone Ringer 125,848 3 *
Ringing Phone Light Flasher 229,284 35 *
Simple Phone Tap Derek Tombrello 392,335 98 *
Telephone Hold Button 136,969 10
Telephone Recorder 224,864 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.