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
Wednesday, April 08, 2026		 Automatic 12V Lead Acid Battery Charger12
7 Segment LED Counter11
Yesterday
Tuesday, April 07, 2026		 12VDC To 120VAC Inverter45
FM Transmitter40
Of All Time 12VDC To 120VAC Inverter1,562,425
FM Transmitter1,033,083

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,675 61 *
Car Alarm Arming Horn Beep Canceller bob 145,298 6 *
Wireless Auto Tachometer 354,214 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,321 29 *
Parallel (Printer) Port Interface 300,077 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,182 63 *
3 Channel Spectrum Analyzer 234,137 20
40W Fluorescent Lamp Inverter Bart Milnes 340,597 60 *
Adjustable Strobe Light 321,423 36
Black Light 296,207 29
Colour (Sound) Organ 303,595 36
Electronic Dice NEW! 199,957 10 *
Fantastic Atom Expander 212,229 25
Flash Slave Trigger 232,483 18 *
Infa-Red Remote Control 651,175 216 *
IR Remote Extender NEW! 143,436 3 *
IR Remote Jammer Carl 278,323 110 *
IR Remote Switch NEW! 167,689 9 *
LASER Transmitter/Receiver 430,649 92
LED Chaser 460,251 83 *
LED Metronome NEW! 109,460 3 *
LED Thermometer 216,387 22 *
Light/Dark Detector 315,929 90 *
Simple Colour Organ 146,736 11 *
Strobe Light 285,739 27 *
TRIAC Light Dimmer 566,775 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,924 122 *
Electromagnetic Levitator NEW! 154,189 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,774 214 *
AC Motor Speed Controller 407,705 29 *
Air Flow Detector 262,118 54 *
Digital Keypad Combination Lock 211,894 20
Low Voltage Alarm 240,039 58 *
Pine Racecar Victory Judge 111,567 1 *
Pulse Width Modulation DC Motor Control 668,969 94
Rain Detector 315,954 112 *
Simple Lie Detector 578,276 323
Simple Polarity Tester Dudley LeRoux 175,976 13 *
Simple Servo Controller 232,828 22 *
Simple Touch Switch NEW! 180,982 6 *
Simple Two Speed Contactor DC Motor Controller 216,263 21 *
Stepper Motor Controller 768,118 120 *
Time Delay Relay 568,492 88
Time Delay Relay II jawaharlal@excite.com 258,556 39 *
Touch Switch 301,166 51 *
Video Activated Relay 131,122 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,371 10 *
Water Detector With Sump/Bilge Pump Controller 163,329 18 *
Wire Loop Alarm Alex Meaden 215,447 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,452 25 *
12VDC To 120VAC Inverter 1,562,425 691
6V to 12V Converter 542,715 121
Automatic 12V Lead Acid Battery Charger 953,288 248
Automatic Load Sensing Power Switch 178,288 16 *
Car Battery Charger 897,866 159 *
Dual Polarity Power Supply 384,580 84 *
Fixed Voltage Power Supply 322,755 52 *
High Current Power Supply 354,610 66 *
High Voltage High Current Power Supply 275,914 35 *
LASER Power Supply 308,445 28
Portable CD Player Adapter For Car 222,879 12 *
Power Supply 753,254 259 *
Solid State Tesla Coil NEW! 160,064 4
Solid State Tesla Coil/High Voltage Generator 460,875 51
Transformerless Power Supply 475,935 117 *
Voltage Inverter 356,680 51 *
Voltage Inverter II 214,939 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,947 182
3 Watt FM Transmitter Rae XL Tkacik 352,065 83 *
50 Watt Amplifier 522,588 74
8 Note Tune Player 150,643 12 *
8 Watt Audio Amp 389,042 67 *
Aircraft Radio Communications Receiver 293,571 50 *
Crystal Radio 172,605 53 *
Digital Volume Control 351,987 47 *
Electronic Stethoscope 335,190 142 *
FET Audio Mixer 355,925 41
FM Transmitter 1,033,083 420
Guitar Fuzz Effect 261,498 54 *
Microphone Mixer Anatoly I. Shikhatov 262,392 26 *
Mono To Stereo Synthesizer oRbEq 146,090 18 *
One Tube Regenerative Radio NEW! 163,441 4 *
Op Amp Radio 404,678 80 *
Single Chip AM Radio NEW! 110,692 4 *
Single Chip FM Radio NEW! 186,082 1 *
Sound Level Meter 354,466 51 *
Stereo Tube Amplifier Weslee Kinsler 281,193 15 *
Tone Control 322,870 31
Transistor Organ 212,153 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,943 27 *
FM Telephone Bug 244,366 57
Phone Busy Indicator 223,843 24 *
Remote Telephone Ringer 127,457 3 *
Ringing Phone Light Flasher 231,429 35 *
Simple Phone Tap Derek Tombrello 393,981 98 *
Telephone Hold Button 138,441 10
Telephone Recorder 226,325 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.