The folks at [electro-labs] designed this simple USB power meter which does just that. ... check the awesome Friedcircuits USB Tester which we reviewed earlier and is available in the Hackaday Store.

The tester itself is relatively simple to build. As you can see in the video below, it consists of a power supply, an LED, a few resistors, a pair of known transistors, and not much else.

Power consumption must be low so that if you accidentally leave the tester on overnight, it will not discharge the battery. The tester must operate even with low battery voltage. Continuity requires a ...

be quiet! has been brewing an ATX 3.0 compatible power supply for a while now, meet the Dark Power 13. Initially released as 1000W, 850W, and 750W models we'll check out the first one. Now, don't ...

Two simple USB inventions provide an easy way to test USB cables and chargers, ensuring they are functioning properly. The first invention uses a small plastic ball and a USB female connector to ...

Our first check is with a simple power supply tester, we monitor voltages quickly and check if all rails are working properly and within spec (spot-on perfect actually).