My current project uses panel meters and is taking longer than expected. So I decided to put up a video on my experience with these cheap eBay panel meters, in particular how to power them safely and how to use them to measure voltage and current in power supply that has a positive and negative rail.
00:00 eBay panel meters
00:50 2 and 3-wire meters
01:42 Regulator limits
03:19 3-wire test
04:14 2-wire test
04:37 construction
05:56 simplified schematics
07:04 wiring scheme
07:37 getting a safe supply voltage
10:31 use with pos & neg rails
11:29 current accuracy
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