[linux-audio-user] Re: 192kHz

[fons adriaensen]

On Sun, Jan 29, 2006 at 10:55:05PM +0000, Folderol wrote:

> No! It is definitely 1/c1 + 1/c2 ... 
> 
> The only alternative I know of is 'product divided by sum' which is
> often easier to use.
> 
> i.e.
> 
> (c1 x c2 x c3) / (c1 + c2 + c3)

Sorry, all wrong, as can be seen easily by considering the dimensions.
The first one is 1/Farad, the second Farad^2.

The rule is the same as for parallell resistors:

 The inverse of the equivalent value is the sum of the inverses
 of all individual values.

 1/Ceq = 1/C1 + 1/C2 + 1/C3 + ...

or for just two of them

 Ceq = (C1 * C2) / (C1 + C2)

-- 
FA