Voltage monitor circuit

  
This circuit gives an early warning of the discharge of batteries. Zener diode Dl is chosen for the voltage below which an indication is required (9 V). Should the supply drop to below 7 V, Dl will cease conducting causing Ql to shut off.
Voltage monitor circuit - schematic

Its collector voltage will now increase causing Q2 to start conducting via LED1 and its limiting resistor R4.




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