LED Battery Voltmeter

Eklektix Com Solar

Forrest Cook This article describes a low power voltmeter circuit that can be used with alternative energy systems that run on 12 or 24 volt battery banks. The voltmeter is an expanded scale type that indicates small voltage steps over a 10 to 16 volt range for 12 V batteries and over a 22 to 32 volt range for 24 volt batteries. It is possible to set the meter to read equal steps across a variety of upper and lower voltages. Power consumption can be as low as 14 mW when...