Car battery monitor III

Posted on Mar 1, 2013

The circuit is quick and easy to put together and install, and tells you when battery voltage falls below the set limit as established by Rl (a 10,000-ohm potentiometer). It can indicate, via LED 1, that the battery may be defective or in need of change if operating the starter causes the battery voltage to drop belciw the present limit.

Car battery monitor III
Click here to download the full size of the above Circuit.

You can use the 2N3904 or any equivalent.

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