Undervoltage Detector

The output goes high when the supply falls below a value determined by zener diode Dl. If Dl is a 5.6-V zener, the op
Undervoltage Detector - schematic

amp will switch high when the supply voltage falls below approximately 11 V. The precise trip point can be varied by replacing R3 with an 820-ki) resistor in series with a 470-KOhmhm potentiometer.

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