Nelson Pass said:Papa has a large quantity of 25V 15,000 uF caps.
Thats a good reason
Having many 25V caps, and needing 50V's, option 1 is good. Flexibility is a good thing, and using the same supply for different amps, has a lot going for it.By looking at option 1 and 2 (without considering anything else) they are equally good, ripplewise. The bad news about option 1 is that you need 4 caps, not 2 as in option 2. The caps for option 2 will ofcourse need to be higher voltage rated. The good news about option 1 is that you can use lower voltage rated caps. 2 x 25V caps connected in series will equal a 50V, but at half the capacitance (assuming they are the same e.g. 15.000uF, which results in 7500uF)
This should clear up the issue
Just pick the most suitable option, after checking your inventory of caps.
Variac said:
So is the final word that it is indeed better to use option one?
I'll let you think about it another night Babo
It has been long night . . .
Still I can't remember whether I have said option one is better.
Papa's PSU boards provided for F-amps are transfomers in three ways. Here I attach one method that fits for F3. Looking at this F3 PSU and amp circuit, I feel that Papa must be crazy, or at least crazy enough.
With this F3 PSU, I have estimated the peak-to-peak ripple voltage on the rail of 46Vdc. It is about 0.6Vp2p with 1.5A load current per channel. It is calculated to ripple factor of about 0.004, i.e. 0.4%. On top of this, the amp cuircuit has even a capacitor multiplier at its power supply entrence
Papa irons and irons the rail just flat . . .
Mark, I would use any of option one or two at my convinience.
Cheers,
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