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BrianG · 01.18.2008, 05:33 PM

Since it takes 5 time constants to get to 100% (or really close). I would pick something like 10 seconds, divide that by 5, and then use the formula to get 740 ohms for your resistor. Anything between 680 and 1k would be good enough since any voltage value on the cap over 0v will help reduce that spark.

	(#3)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	01.18.2008, 05:33 PM Since it takes 5 time constants to get to 100% (or really close). I would pick something like 10 seconds, divide that by 5, and then use the formula to get 740 ohms for your resistor. Anything between 680 and 1k would be good enough since any voltage value on the cap over 0v will help reduce that spark.