How to wire digital dual display volt- and ammeter

 

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.

Important!

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
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

 

Wired and testing with load- overview

Wired and testing with load- overview

 

One test with external power supply

Volt ammeter with external power supply

Volt ammeter with external power supply

 

 

 

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