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amblum
modified 5 years ago

Zener Diode LED Voltmeter

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1
191
04:06:57
LEDs indicate the voltage based on the breakdown voltage for the zener diodes
published 5 years ago
wyoelk
5 years ago
Leds in this app are all 2V and 20ma. To find the value for the current limiting resistor, the issue is the zener that drops the voltage. 12v-5v=7v-2v=5v÷20ma=250ohm or 12v-9v=3v-2v=1v÷20ma=50ohm

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