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Old 14th October 2004, 08:42 AM   #1
Prune is offline Prune  Canada
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Question LED capacitors

I'm using capacitors in series for higher voltage. I noticed that one of the capacitors was being overvoltaged and it turned out that an equalizing resistor was not soldered well. To avoid this in the future, I want to use LED indicators on each cap so that I can tell if everything is OK with a quick look inside the case. Can someone suggest how I can make it so that a green LED will be on when voltage across the cap is above 300 V and a red one when above 400 V? Since I need a total of 16 indicators, I need the smallest part count circuit that will do this. Any ideas?
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Old 14th October 2004, 06:55 PM   #2
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Zener in series with resistor and LED, but neon lights stacked to 500V or so would do better. With a current limiting resistor of course...

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Old 16th October 2004, 08:05 PM   #3
cpemma is offline cpemma  United Kingdom
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What current are the equalising resistors carrying? An LED in series with each will glow if there's 0.5-30mA and show if the resistors are working.
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