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Low battery indicator

2016-05-09 23:04  
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Under good battery conditions the LED is off. As the battery voltage falls, the LED begins to flash until, in the low battery condition, the LED lights continuously. Designed for a 9-volt battery, with the values shown the LED flashes from 7.5 to 6.5 volts.
Low battery indicator

The transistor is the BFY90 and the IC is the SN72741P.

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