Three-step level indicator

Posted on Jul 17, 2012

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
Click here to download the full size of the above Circuit.

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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