LM393 - Low Battery Indicator

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07:35:51

Voltage Sense using an LM393.

The mosfets aren't needed in real world applications — they're acting as the collectors of the LM393 outputs.

(Can be used with a diy op amp comparator by using the mosfets as simulated or by using the outputs to power the LEDs directly.)

Red LED = battery < ~3.3V.
Green LED = battery > ~3.3V

Using 5ma LEDs here.

Use a potentiometer/trimmer for your two voltage divider reference.

published 1 year ago

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