LED capacitors

Prune · 14th October 2004, 08:42 AM

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?

Sch3mat1c · 14th October 2004, 06:55 PM

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...

Tim

cpemma · 16th October 2004, 08:05 PM

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.

14th October 2004, 08:42 AM	#1
Prune Account Disabled Join Date: Mar 2003 Location: Vancouver	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?

14th October 2004, 06:55 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	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... Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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16th October 2004, 08:05 PM	#3
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	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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