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| Created | October 31, 2012 |
| Last modified | March 16, 2013 |
| Tags | No tags. |
Make your own battery tester.
Digital devices often reject batteries once the voltage drops a little, even when they still have plenty of useful charge. This circuit uses a resistor voltage divider to give a RGB instant view of battery state. Plenty of Green is good for any use. Yellow may be good for a flashlight, radio or other non digital device. Only Red showing is probably too low to be useful.
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