I bought this cheap “chinese” volt- and ammeter gauge. This has shunt built-in so I don’t have to mess around with that. Unfortunately I didn’t find any good resource how to wire/connect it. Actually it’s not rocket science, but I had waited it for 2-3 weeks and didn’t want to blow it at first try. All the diagrams were somehow very confusing for me. Anyway- here is how I wired it.
Mine had thick black, red and blue wires. Thin ones are red and black for power supply for chip itself. If you have some other kind of volt- and ammeter look for some other resource on internet. This is written exactly for this one. Will add some other material in future.
- Wiring volt-ammeter without external power supply for chip
My voltammeter has operating voltage DC 4.5 ~ 30V and I am not gonna measure voltages over 30V at moment. So I wired it to feed itself, but it also can be feed by external power supply- like 9V battery or such. In my case- you only have to connect red wire to positive side. Black wire (ground) is not needed. But when wiring so- check your gauge’s operating voltage beforehand.
Here are some photos about testing.
Wired and testing with load
Wired and testing with load- overview
One test with external power supply
Volt ammeter with external power supply