News post & update: eleccircuit.com |  |
| Battery voltage monitor circuit by LM339 Posted: 16 Mar 2014 12:06 AM PDT This simple low voltage tester circuit can be used to monitor battery and other voltage sources of current for problems, by LED display and alarm sound. Which this circuit is used to check voltage of 9-volts battery. Description We use a LM339 Quad Comparator 14pin IC is base of this circuit and a few parts […]  |
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