Three Very Simple circuit and some Variations. Play with it.
These can be useful to Monitor a Car Battery and Alternator charging. But they will NOT tell you if a battery is good or not. Nor do they give an exact indication of a Full Charge on the battery.
All parts are cheap and should be easily obtained, and None are very critical. Also, Q1 and Q2 can be almost any NPN, Signal type transistor.
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