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Hi
I was told that when connecting capacitors in series to increase voltage ratings I have to put a resistor inbetween to balance the voltages.
Could someone please tell me which terminals to connect the resistor to,on the caps and also how to calculate the value of the resistor.
REGARDS
RAJIV
Follow Ups:
You have the arrangement wrong. It should be a resistor across (in parallel with) each capacitor instead of a single resistor in-between the capacitors. Multi-section electrolitic-construction capacitors cannot be used in such an arrangement. Perform a search of the Asylum's TubesDIY forum archives as this is a standard power supply topology rather than a tweak.
See Ray Moth's reply to the recent (01-27-07) bleeder resistor thread in TubesDIY forum.
The idea is to force the caps to share the voltage equally. Without parallel Rs, they will share according to their leakage resistance.If they both (assuming only 2 caps) have the same resistance there will be no problem, but how to know or measure their leakage resistance? Difficult without special equipment as the effective R can be very high indeed, especially with dialectrics like teflon or polyprop.
I always try to calculate a value which has minimum effect on the circuit in question, but which is clearly much lower than the effective leakage resistance. Something like 10megohms will usualy do the trick.
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