Category Archives: My Projects

This power supply is easy to build and fun to make. It will have 2 meters 1 for voltage and 1 for current. They will both be DC voltmeters, for the amp meter we will use a shunt resistor. Here’s the part list: Qty Name All Electronics Cat# Sub-total total 1 LM317T Adjustable regulator LM317T […]

This useful cord can allow an Android Phone/Tablet to be used as an osciloscope. All you need is the 4-pole 3.5mm jack to 3 rca cable. The cord will need to be modified and be tested with an resistance meter, so you can figure out which wire goes where. NOTE: EVERY CORD IS DIFFERNET! Also […]

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 […]

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 […]

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 […]