Hi everyone, I'm new to this board so I hope this question is in the right place. I'm working on a power supply for a prototyping board, and I thought a digital voltmeter/ammeter would be a nice touch. So I ordered a $6 special from eBay from Hong Kong, and when it arrived, it's a three-wire digital display. Red, black, and yellow.
However, I'm left scratching my head as to how in the world this is supposed to be both a voltmeter and ammeter with only three wires. Red and black cause the voltmeter to come on, and display the voltage as expected. However, I can't figure out how to connect the ammeter so it outputs anything that makes sense. I've tried connecting the 'load' to the yellow wire, both on the positive and negative terminals to no avail. Since there was no instruction sheet in the package, unless someone can read Chinese, the sticker on the device probably won't do you any good. Anyone have any ideas? Thanks in advance.
However, I'm left scratching my head as to how in the world this is supposed to be both a voltmeter and ammeter with only three wires. Red and black cause the voltmeter to come on, and display the voltage as expected. However, I can't figure out how to connect the ammeter so it outputs anything that makes sense. I've tried connecting the 'load' to the yellow wire, both on the positive and negative terminals to no avail. Since there was no instruction sheet in the package, unless someone can read Chinese, the sticker on the device probably won't do you any good. Anyone have any ideas? Thanks in advance.