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		 AC Motor Speed Controller7
8 Watt Audio Amp6
Yesterday
Thursday, August 07, 2025		 12VDC To 120VAC Inverter39
One Tube Regenerative Radio34
Of All Time 12VDC To 120VAC Inverter1,551,317
FM Transmitter1,024,323

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,014 61 *
Car Alarm Arming Horn Beep Canceller bob 141,952 6 *
Wireless Auto Tachometer 349,852 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,304 29 *
Parallel (Printer) Port Interface 294,825 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,459 63 *
3 Channel Spectrum Analyzer 229,704 20
40W Fluorescent Lamp Inverter Bart Milnes 336,508 60 *
Adjustable Strobe Light 316,993 36
Black Light 290,897 29
Colour (Sound) Organ 298,514 36
Electronic Dice NEW! 195,737 10 *
Fantastic Atom Expander 208,607 25
Flash Slave Trigger 228,171 18 *
Infa-Red Remote Control 646,118 216 *
IR Remote Extender NEW! 139,347 3 *
IR Remote Jammer Carl 273,899 110 *
IR Remote Switch NEW! 163,733 9 *
LASER Transmitter/Receiver 425,767 92
LED Chaser 454,750 83 *
LED Metronome NEW! 105,602 3 *
LED Thermometer 212,868 22 *
Light/Dark Detector 312,095 90 *
Simple Colour Organ 143,161 11 *
Strobe Light 281,979 27 *
TRIAC Light Dimmer 561,652 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,770 122 *
Electromagnetic Levitator NEW! 150,494 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,859 214 *
AC Motor Speed Controller 401,714 29 *
Air Flow Detector 258,244 54 *
Digital Keypad Combination Lock 208,060 20
Low Voltage Alarm 235,793 58 *
Pine Racecar Victory Judge 108,173 1 *
Pulse Width Modulation DC Motor Control 663,725 94
Rain Detector 311,748 112 *
Simple Lie Detector 573,214 323
Simple Polarity Tester Dudley LeRoux 171,704 13 *
Simple Servo Controller 228,548 22 *
Simple Touch Switch NEW! 176,620 6 *
Simple Two Speed Contactor DC Motor Controller 212,067 21 *
Stepper Motor Controller 760,766 120 *
Time Delay Relay 563,804 88
Time Delay Relay II jawaharlal@excite.com 254,253 39 *
Touch Switch 296,998 51 *
Video Activated Relay 127,669 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,416 10 *
Water Detector With Sump/Bilge Pump Controller 159,220 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! 326,821 25 *
12VDC To 120VAC Inverter 1,551,317 691
6V to 12V Converter 537,244 121
Automatic 12V Lead Acid Battery Charger 947,195 248
Automatic Load Sensing Power Switch 174,166 16 *
Car Battery Charger 892,495 159 *
Dual Polarity Power Supply 379,333 84 *
Fixed Voltage Power Supply 318,820 52 *
High Current Power Supply 349,037 66 *
High Voltage High Current Power Supply 271,451 35 *
LASER Power Supply 304,234 28
Portable CD Player Adapter For Car 218,820 12 *
Power Supply 748,193 259 *
Solid State Tesla Coil NEW! 154,592 4
Solid State Tesla Coil/High Voltage Generator 454,719 51
Transformerless Power Supply 471,299 117 *
Voltage Inverter 350,568 51 *
Voltage Inverter II 210,763 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,473 182
3 Watt FM Transmitter Rae XL Tkacik 346,257 83 *
50 Watt Amplifier 517,466 74
8 Note Tune Player 147,007 12 *
8 Watt Audio Amp 383,171 67 *
Aircraft Radio Communications Receiver 288,317 50 *
Crystal Radio 166,980 53 *
Digital Volume Control 347,241 47 *
Electronic Stethoscope 330,166 142 *
FET Audio Mixer 351,683 41
FM Transmitter 1,024,323 420
Guitar Fuzz Effect 256,069 54 *
Microphone Mixer Anatoly I. Shikhatov 258,093 26 *
Mono To Stereo Synthesizer oRbEq 141,662 18 *
One Tube Regenerative Radio NEW! 156,470 4 *
Op Amp Radio 399,511 80 *
Single Chip AM Radio NEW! 106,639 4 *
Single Chip FM Radio NEW! 181,027 1 *
Sound Level Meter 349,870 51 *
Stereo Tube Amplifier Weslee Kinsler 275,978 15 *
Tone Control 317,892 31
Transistor Organ 207,746 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,471 27 *
FM Telephone Bug 241,012 57
Phone Busy Indicator 220,211 24 *
Remote Telephone Ringer 123,952 3 *
Ringing Phone Light Flasher 226,410 35 *
Simple Phone Tap Derek Tombrello 390,190 98 *
Telephone Hold Button 135,151 10
Telephone Recorder 222,883 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.