Auto VTVM

A 70s-era Volt-Ohmmeter was refurbished using a PICAXE instead of RTL logic.This shows the finished V-O-M. It was worth the effort in order to re-cycle the excellent meter and the military-quality indicators. The solid oak box is new, as the old one was much the worse for wear. Besides, the nice box adds a psychological justification for the effort. 

Some subassemblies could be recycled.

The power supply at the back is separated by a metal sheet.

The meter amplifier is bolted to the meter terminals.

Power Supply      

Processor

Range indicator drivers