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, August 08, 2025		 FM Transmitter12
Parallel (Printer) Port Interface11
Yesterday
Thursday, August 07, 2025		 12VDC To 120VAC Inverter39
One Tube Regenerative Radio34
Of All Time 12VDC To 120VAC Inverter1,551,319
FM Transmitter1,024,329

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,016 61 *
Car Alarm Arming Horn Beep Canceller bob 141,955 6 *
Wireless Auto Tachometer 349,858 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,309 29 *
Parallel (Printer) Port Interface 294,833 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,460 63 *
3 Channel Spectrum Analyzer 229,706 20
40W Fluorescent Lamp Inverter Bart Milnes 336,509 60 *
Adjustable Strobe Light 316,995 36
Black Light 290,899 29
Colour (Sound) Organ 298,518 36
Electronic Dice NEW! 195,740 10 *
Fantastic Atom Expander 208,608 25
Flash Slave Trigger 228,173 18 *
Infa-Red Remote Control 646,120 216 *
IR Remote Extender NEW! 139,349 3 *
IR Remote Jammer Carl 273,903 110 *
IR Remote Switch NEW! 163,734 9 *
LASER Transmitter/Receiver 425,769 92
LED Chaser 454,752 83 *
LED Metronome NEW! 105,604 3 *
LED Thermometer 212,869 22 *
Light/Dark Detector 312,097 90 *
Simple Colour Organ 143,164 11 *
Strobe Light 281,981 27 *
TRIAC Light Dimmer 561,654 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,774 122 *
Electromagnetic Levitator NEW! 150,497 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,864 214 *
AC Motor Speed Controller 401,717 29 *
Air Flow Detector 258,246 54 *
Digital Keypad Combination Lock 208,063 20
Low Voltage Alarm 235,794 58 *
Pine Racecar Victory Judge 108,174 1 *
Pulse Width Modulation DC Motor Control 663,726 94
Rain Detector 311,749 112 *
Simple Lie Detector 573,216 323
Simple Polarity Tester Dudley LeRoux 171,706 13 *
Simple Servo Controller 228,549 22 *
Simple Touch Switch NEW! 176,624 6 *
Simple Two Speed Contactor DC Motor Controller 212,067 21 *
Stepper Motor Controller 760,770 120 *
Time Delay Relay 563,807 88
Time Delay Relay II jawaharlal@excite.com 254,258 39 *
Touch Switch 297,001 51 *
Video Activated Relay 127,671 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,420 10 *
Water Detector With Sump/Bilge Pump Controller 159,222 18 *
Wire Loop Alarm Alex Meaden 211,857 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,824 25 *
12VDC To 120VAC Inverter 1,551,319 691
6V to 12V Converter 537,250 121
Automatic 12V Lead Acid Battery Charger 947,201 248
Automatic Load Sensing Power Switch 174,167 16 *
Car Battery Charger 892,497 159 *
Dual Polarity Power Supply 379,334 84 *
Fixed Voltage Power Supply 318,821 52 *
High Current Power Supply 349,042 66 *
High Voltage High Current Power Supply 271,452 35 *
LASER Power Supply 304,236 28
Portable CD Player Adapter For Car 218,822 12 *
Power Supply 748,196 259 *
Solid State Tesla Coil NEW! 154,596 4
Solid State Tesla Coil/High Voltage Generator 454,720 51
Transformerless Power Supply 471,300 117 *
Voltage Inverter 350,572 51 *
Voltage Inverter II 210,765 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,476 182
3 Watt FM Transmitter Rae XL Tkacik 346,263 83 *
50 Watt Amplifier 517,469 74
8 Note Tune Player 147,009 12 *
8 Watt Audio Amp 383,172 67 *
Aircraft Radio Communications Receiver 288,319 50 *
Crystal Radio 166,982 53 *
Digital Volume Control 347,243 47 *
Electronic Stethoscope 330,172 142 *
FET Audio Mixer 351,685 41
FM Transmitter 1,024,329 420
Guitar Fuzz Effect 256,071 54 *
Microphone Mixer Anatoly I. Shikhatov 258,095 26 *
Mono To Stereo Synthesizer oRbEq 141,664 18 *
One Tube Regenerative Radio NEW! 156,476 4 *
Op Amp Radio 399,512 80 *
Single Chip AM Radio NEW! 106,642 4 *
Single Chip FM Radio NEW! 181,027 1 *
Sound Level Meter 349,872 51 *
Stereo Tube Amplifier Weslee Kinsler 275,980 15 *
Tone Control 317,895 31
Transistor Organ 207,750 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,475 27 *
FM Telephone Bug 241,013 57
Phone Busy Indicator 220,212 24 *
Remote Telephone Ringer 123,954 3 *
Ringing Phone Light Flasher 226,412 35 *
Simple Phone Tap Derek Tombrello 390,192 98 *
Telephone Hold Button 135,153 10
Telephone Recorder 222,885 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.