Voltage Monitor Circuit

  
The adjustable voltage monitor can be used to check whether the voltage in a circuit remains within a given range. If the dc voltage is less than the voltage at pin 5 of-Ul-B, then LED 1 will light. If the voltage is over 5V, LED2 will light. If the voltage is within the window set by R4 and R5, neither LED will light.
Voltage Monitor Circuit - schematic

This circuit is useful as an under-or-over voltage monitor.




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