Three-step level indicator

  
This circuit makes a very compact level indicator where a meter would be impractical or not justified due to cost. Resistor values will depend on type of LED used. For MV50 LEDs the resistors are 2 K for steps of approx 2 V and current drain with all three LEDs on of 5 mA
Three-step level indicator - schematic

The chain can be extended but current drain increases rapidly and the first LED carries all the current drawn from the supply.




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