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/diy/ - Do It Yourself

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>> No.2754453 [View]
File: 54 KB, 399x317, Voltmeter-circuit-with-zener-diodes.png [View same] [iqdb] [saucenao] [google]
2754453

>>2754359
>sends power to the LED as soon as a set voltage (above 12v) is achieved?

use this type of circuit.
a 10V zener in series with a 2V LED will only turn on when voltage is above 12V.
size the resistor so you wont surpass 20mA at 30V, or whatever is the max.
ex.: for 30V, do (30-12) / .02 = 900 ohms

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