This circuit was found in a 1974 publication. It consists of a voltmeter for high voltages, up to more than 100 V, using a neon lamp.
This S-meter or signal strength meter, was originally designed for the 80's Regency receiver, but can...
This circuit is intended to reduce the 12V from a car outlet to 9V. The current is in the order of a...
This sensitive millivoltmeter for alternating voltages was found in a French publication in 1996...