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In Reply to: RE: Bypassing Speaker Caps posted by Paully on July 16, 2007 at 06:58:46
When you put two caps in series (same value caps) the voltage rating doubles but the capacitance falls by 50%.
If you "bypassed" a cap with another one then the values add.
Kinda like resistors only backwards:)
Russ
Follow Ups:
Time to go read up, I don't see how capacitance can fall (not saying you are wrong, saying I don't understand).
But what I do gather is that two caps in parallel adds capacitance. Got that, thanks!
Any recommendations on what to caps to use? Would you use a 68uf Solen and bypass it then use better caps on higher frequencies (or not bypass it all), maybe just use Solen throughout, or do you have any caps that are good for speaker crossovers that don't cost an arm and a leg? I mention Kimber Kap above and I think Dayton is reasonable.
Hornlover's explanation is correct. Oddly enough, a good way to remember it is to consider non-polarized electrolytic caps. The reason why non-polarized caps are so expensive is because each cap is two polarized caps wired in series. Consequently, each of their values is cut in half. So, your 68uF cap is actually two 136uF polarized caps wired in series with their positive terminal pointed out. So, if you wanted to bypass your 68uF non-polarized cap and maintain the same capacitance, you could wire two 100uF polarized caps in series, with their positive terminals facing outward , and bypass the whole with a 10uf and an 8uf film caps in parallel.
Capacitors work the opposite of resistors. With resistors, when wired in series, the values add. When wired in parallel, the value reduces. With caps, when wired in series, the value reduces, and when wired in parallel, the values add. The formula for series caps (and parallel resistors) is:
V total= 1/(1/v1 + 1/v2 + 1/v3 etc.)
where v=value.
In series, capacitor voltage increases. For instance, two 68uF 50V caps in series becomes 34uF @ 100V.
Caps in parallel, add the values together, but voltage stays the same.
To add capacitance to a circuit, all caps need to see the same voltage. So, they need to be connected to the same source voltage. So, they need to be connected in parallel. :)
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