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
Tuesday, July 15, 2025		 12VDC To 120VAC Inverter38
One Tube Regenerative Radio29
Yesterday
Monday, July 14, 2025		 LASER Transmitter/Receiver45
FM Transmitter41
Of All Time 12VDC To 120VAC Inverter1,550,396
FM Transmitter1,023,581

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,716 61 *
Car Alarm Arming Horn Beep Canceller bob 141,717 6 *
Wireless Auto Tachometer 349,561 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,069 29 *
Parallel (Printer) Port Interface 294,418 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,153 63 *
3 Channel Spectrum Analyzer 229,375 20
40W Fluorescent Lamp Inverter Bart Milnes 336,218 60 *
Adjustable Strobe Light 316,613 36
Black Light 290,527 29
Colour (Sound) Organ 298,132 36
Electronic Dice NEW! 195,449 10 *
Fantastic Atom Expander 208,372 25
Flash Slave Trigger 227,878 18 *
Infa-Red Remote Control 645,756 216 *
IR Remote Extender NEW! 139,057 3 *
IR Remote Jammer Carl 273,555 110 *
IR Remote Switch NEW! 163,431 9 *
LASER Transmitter/Receiver 425,386 92
LED Chaser 454,382 83 *
LED Metronome NEW! 105,313 3 *
LED Thermometer 212,581 22 *
Light/Dark Detector 311,830 90 *
Simple Colour Organ 142,888 11 *
Strobe Light 281,737 27 *
TRIAC Light Dimmer 561,336 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,457 122 *
Electromagnetic Levitator NEW! 150,220 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,435 214 *
AC Motor Speed Controller 401,281 29 *
Air Flow Detector 257,946 54 *
Digital Keypad Combination Lock 207,776 20
Low Voltage Alarm 235,487 58 *
Pine Racecar Victory Judge 107,946 1 *
Pulse Width Modulation DC Motor Control 663,285 94
Rain Detector 311,469 112 *
Simple Lie Detector 572,803 323
Simple Polarity Tester Dudley LeRoux 171,411 13 *
Simple Servo Controller 228,217 22 *
Simple Touch Switch NEW! 176,282 6 *
Simple Two Speed Contactor DC Motor Controller 211,726 21 *
Stepper Motor Controller 760,182 120 *
Time Delay Relay 563,460 88
Time Delay Relay II jawaharlal@excite.com 253,968 39 *
Touch Switch 296,656 51 *
Video Activated Relay 127,433 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,137 10 *
Water Detector With Sump/Bilge Pump Controller 158,962 18 *
Wire Loop Alarm Alex Meaden 211,561 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,321 25 *
12VDC To 120VAC Inverter 1,550,396 691
6V to 12V Converter 536,811 121
Automatic 12V Lead Acid Battery Charger 946,812 248
Automatic Load Sensing Power Switch 173,869 16 *
Car Battery Charger 892,076 159 *
Dual Polarity Power Supply 378,936 84 *
Fixed Voltage Power Supply 318,495 52 *
High Current Power Supply 348,625 66 *
High Voltage High Current Power Supply 271,112 35 *
LASER Power Supply 303,891 28
Portable CD Player Adapter For Car 218,536 12 *
Power Supply 747,837 259 *
Solid State Tesla Coil NEW! 154,176 4
Solid State Tesla Coil/High Voltage Generator 454,240 51
Transformerless Power Supply 470,941 117 *
Voltage Inverter 349,981 51 *
Voltage Inverter II 210,459 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,080 182
3 Watt FM Transmitter Rae XL Tkacik 345,501 83 *
50 Watt Amplifier 517,008 74
8 Note Tune Player 146,775 12 *
8 Watt Audio Amp 382,709 67 *
Aircraft Radio Communications Receiver 287,922 50 *
Crystal Radio 166,605 53 *
Digital Volume Control 346,864 47 *
Electronic Stethoscope 329,819 142 *
FET Audio Mixer 351,398 41
FM Transmitter 1,023,581 420
Guitar Fuzz Effect 255,714 54 *
Microphone Mixer Anatoly I. Shikhatov 257,788 26 *
Mono To Stereo Synthesizer oRbEq 141,362 18 *
One Tube Regenerative Radio NEW! 155,813 4 *
Op Amp Radio 399,117 80 *
Single Chip AM Radio NEW! 106,360 4 *
Single Chip FM Radio NEW! 180,608 1 *
Sound Level Meter 349,578 51 *
Stereo Tube Amplifier Weslee Kinsler 275,649 15 *
Tone Control 317,560 31
Transistor Organ 207,415 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,231 27 *
FM Telephone Bug 240,768 57
Phone Busy Indicator 219,941 24 *
Remote Telephone Ringer 123,688 3 *
Ringing Phone Light Flasher 226,042 35 *
Simple Phone Tap Derek Tombrello 389,897 98 *
Telephone Hold Button 134,902 10
Telephone Recorder 222,628 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.