Hello to all! I've been watching Breaktru's copper mods for a while, as they have been the inspiration for a "Steampunk" design I've been working on. Basics: VV from 4 AA rechargables (3.6 or 4.8v) since I have lots of those lying around, mechanical switches and safety, and a re-work of a small analog voltmeter movement (scrounged it from a pocket battery meter) that I want to make look like a pressure gauge.
The gauge is where I need some help. I'm very rusty on my electronics skills and resistance figuring. How would I wire that up for just 2 voltages, 3.6 and 4.8v? It doesn't matter where the needle falls, as I'm going to make a new backing for the face anyway. Sticking to the mechanical theme, you will physically choose either 3 or 4 batteries with a switch.
Thanks for all the great mods and ideas on here, Breaktru!