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From: "Ron Hubbard"
Subject: Re: A Coupling Capacitor Question?
Date: Fri, 13 Dec 2002 11:28:38 -0800
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The caps are indeed just for coupling between filters and
aren't technically apart of the filters.
John Woodgate wrote in message ...
>I read in sci.electronics.design that Ron Hubbard
> wrote (in 43450.news.dfncis.de>) about 'A Coupling Capacitor
Question?', on Thu,
>12 Dec 2002:
>>I'm working on a project that has a couple of Sallen and Key
>>filters coupled together ( a low pass filter cascaded to a
>>filter to make a bandpass filter) by a number of 0.47 uF
>>For some reason, those 0.47 uF caps are scarce in my neck
>>the woods for the moment and I'm wondering if I could use 1
>>caps without changing the frequency characteristics of the
>It depends on whether the coupling capacitor at the input of
>filter is just for coupling or part of the filter. Is it an
>filter consisting of a passive single section followed by one
>Regards, John Woodgate, OOO - Own Opinions Only.
>Interested in professional sound reinforcement and
distribution? Then go to
>PLEASE do NOT copy news posts to me by E-MAIL!
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