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From: pmr@drufl.UUCP
Newsgroups: net.audio
Subject: Re: difference between DC & AC
Message-ID: <868@drufl.UUCP>
Date: Fri, 9-Mar-84 15:45:00 EST
Article-I.D.: drufl.868
Posted: Fri Mar  9 15:45:00 1984
Date-Received: Sat, 10-Mar-84 13:06:28 EST
References: <1639@sdccsu3.UUCP>, <2073@ihuxf.UUCP>
Organization: AT&T Information Systems, Denver
Lines: 16

AC coupling not only limits the frequency response at the low end but
also is necessary in some types of amplifier designs to maintain the
correct voltage levels (bias) for the next gain stage.

The types of capacitors used also effect the quality of the signal
passed to the next gain stage.  Plastic dielectric capacitors have
less reverse leakage and more linear impedances at higher frequencies
than the commonly used non-polar electrolytic capacitor.  Using plastic
dielectric capacitors like polystyrene or metalized polypropylene,
although debated by some as to their audibility, helps improve the
overall sound.

		Yours for higher fidelity,
		Phil Rastocny
		AT&T-ISL
		..!drufl!pmr