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Category Archives: My Projects

PN Junction tester

This transistor tester tests bipolar junction transistors junctions. It tests the junctions for open and short circuits. It uses 4 resistors, 4 LEDs and 1 SPDT switch. A good transistor will only have 2 out of 4 LEDs lit, on one side of the switch and 4 on the other. You can also test standard […]

Posted byJustin RoederJune 21, 2019June 21, 2019Posted inMy ProjectsLeave a comment on PN Junction tester

Adjustable Circuit Breaker

Tired of having to replace fuses for your projects? Different projects require different current ratings? Then you should build this circuit! All you need is 1x Voltage Comparator(Like LM311) or an Opamp make sure that they are compatible with a single supply 1x Shunt Resistor(use 1 ohm if you are planing on using panel voltmeter(the […]

Posted byJustin RoederJune 14, 2019September 16, 2019Posted inMy ProjectsLeave a comment on Adjustable Circuit Breaker

Audio Relay Driver Circuit

This circuit can be used for flashing lights to sound coming from a computer,iPod,mp3, CD Player, etc… The circuit works as a Single Transistor Amplifier. It works best with songs with a lot of bass. Works well even with House Current! The transistor can almost be any NPN transistor, as long as the relay doesn’t […]

Posted byJustin RoederJune 14, 2019September 16, 2019Posted inMy ProjectsLeave a comment on Audio Relay Driver Circuit

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