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.

Leave Comment

characters left:

New Circuits