An indicator was designed to forestall any incipient failure of the car battery by providing an indicator of the battery state with three coloured l.e.d.s; green indicating a battery voltage adequate for normal use; yellow, that the voltage is fairly low and red that there is a failure in the electrical system, such as a dead cell, poor connection, defective regulator or generator.
Battery state indicator
Anzeiger fuer den Batteriezustand
Practical Electronics ; 14 , 15 ; 8
1978
1 Seite
Article (Journal)
English
Solid-state instruments. I. Battery voltage indicator
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