8 LED Voltage Meter
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can you show us how to make this?
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can i do this but at a range something more like 0-400volts?
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Its especially nice because each LED has a variable region of intensity around the Zener threshold voltage, so the effect is a very smooth display.
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Do you have a schematic for the build?
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Nope, but its fairly easy to explain. On the negative side of each LED is the negative lead from the power supply. On the positive side of each LED is a Zener Diode with a slightly different value decreasing from the green to red. So as you increase the voltage each zener reaches its breakdown voltage just before the next giving you a volt meter. Enjoy!
Capoau1 2 years ago
Oh and you need a resistor (to protect the LED) in line with each Zener. If you use a single resistor for every Zener I dont think it will work.
Capoau1 2 years ago