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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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In Reply to: back to back output coupling caps posted by reddog on December 31, 2005 at 18:56:03:
In terms of capacitance it is simple:Series caps follow the normal series rule, eg 2 100uF in series are 50uF total.
Where it gets distinctly hairy is with the voltage ratings:Back to back ends up giving a "non polarised" cap with equivalent ratings, eg 2 100uF 16V caps give one 50uF +/-16V cap.
I have seen all kinds of debate as how and why this does or does not work, but it seems to!
Series polarised caps with DC across them are not "a good thing" if it can be avoided. However, I have done this with 10KV voltage multipliers with interesting results.
There has to be some way of sharing the voltage across each cap - usually by a parallel resistor of value lower than the effective cap leakage resistance. Otherwise the lowest leakage cap hogs all of the DC and could end up deaded. But they seem to survive ....
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Follow Ups
- It is a bit wierd .... - clifff 13:07:16 01/01/06 (5)
- Re: It is a bit wierd .... - reddog 18:05:21 01/01/06 (4)
- Ignore Cliff's "No", Blackgate type N are nonpolar (nt) - jcox 20:16:18 03/12/06 (1)
- Whoops! True, indeed! (nt) - clifff 07:23:46 03/13/06 (0)
- No - clifff 15:13:35 01/02/06 (1)
- Re: No - beermanpete@socal.rr.com 18:13:51 01/02/06 (0)
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