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From: bmaraldo@watdcsu.UUCP
Newsgroups: sci.electronics
Subject: Re: Appropriate use of capacitors
Message-ID: <3718@watdcsu.waterloo.edu>
Date: Wed, 5-Aug-87 01:56:34 EDT
Article-I.D.: watdcsu.3718
Posted: Wed Aug  5 01:56:34 1987
Date-Received: Fri, 7-Aug-87 01:54:09 EDT
References: <1108@rtech.UUCP>
Reply-To: bmaraldo@watdcsu.waterloo.edu (Commander Brett Maraldo)
Organization: Unit 36 Research
Lines: 34
Keywords: capacitor

In article <1108@rtech.UUCP> jchan@rtech.UUCP (Jeff Chan) writes:
> I am curious about ceramics, tantalums, electrolytics, metallized and
> foil film capacitors with mylar=polyester, polystyrene, polypropylene,
> polycarbonate, teflon, etc.  Please post to the net.


   I am an audiophile who modifies and upgrades stereo components.  Here is
   my disertation on capacitor usage in related circuits.

   Electrolytics are available in large capacitance values, but the
   voltages generally are low.  They are also not very accurate (a typical
   accuracy might be +50% -10%).  But they are good for power circuits and
   general DC filtering.  Whenever possible, and when the circuit design
   permits, I prefer tantalums over electrolytics.  I have found that
   replacing electrolytics with tantalums in phono pre-amp sections both
   stablize the accuracy of the gain and equalization and reduces the
   level of high frequency noise that could otherwise tear at the high end.
   I also replace any mylar, polyester, ot polycarbonates with
   polypropylene which have much better accuracies and are more useful as
   bypass devices on power rails and bias currents.  Alas, I have never had
   the chance to try out a teflon cap as they are scarse around here.

   Replacing the electrolytics in passive crossovers with high quality
   polypropylene caps also cleans up the mid high to high end.


					Brett L Maraldo


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