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From: John Woodgate
Newsgroups: sci.electronics.design
Subject: Re: A Coupling Capacitor Question?
Date: Fri, 13 Dec 2002 09:38:21 +0000
Organization: JMWA Electronics Consultancy
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Reply-To: John Woodgate
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I read in sci.electronics.design that Ron Hubbard
wrote (in ) 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
>high pass
>filter to make a bandpass filter) by a number of 0.47 uF caps.
>For some reason, those 0.47 uF caps are scarce in my neck of
>the woods for the moment and I'm wondering if I could use 1 uF
>caps without changing the frequency characteristics of the
>filters?
>
It depends on whether the coupling capacitor at the input of the HP
filter is just for coupling or part of the filter. Is it an odd-order
filter consisting of a passive single section followed by one or more
second-order sections?
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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