Quote:
Originally posted by hydrogen18
Another interesting fact: some capacitors work better around their rated voltage. 2x 25000 microfarad 70 volt capacitors gave me poorer regulation that 2x 24000 40 volt capacitors gave me on my 20 volt psu(drops to about 13 under heavy load).
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It is not the voltage rating that determines how well the capacitor filters the ripple. It is the Equivalent Series Resistance (ESR) of the cap. These are independent issues, and a higher voltage cap won't necessarily have a higher ESR.