Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!agate!ig!uwmcsd1!bbn!rochester!kodak!ornitz
From: ornitz@kodak.UUCP (barry ornitz)
Newsgroups: sci.electronics
Subject: Re: Lowering power-supply impedances (Re: Homebrew audio equipment)
Summary: capacitor characteristics well understood
Keywords: capacitors, dielectrics, dissipation, absorption, polymers
Message-ID: <1377@kodak.UUCP>
Date: 5 Aug 88 21:50:56 GMT
References: <1075@gethen.UUCP> <4110007@hpiacla.HP.COM>
Reply-To: ornitz@kodak.UUCP (barry ornitz)
Followup-To: rec.audio
Organization: Eastman Kodak Co, Rochester, NY
Lines: 27

In article <4110007@hpiacla.HP.COM> markt@hpiacla.HP.COM (Mark Thompson) writes:
>My only tip is to resist what science would tell you about passive components
>and use polyproplyne and polystryene where ever possible, they are worth the
>money.

What goes on here?  We "scientists" fully understand the results of nonlinear
dielectrics, dissipation factor, and dielectric absorption.  Speaking as one
who has built custom sample cells and assembled apparatus to measure dielectric
properties of polymers over extended frequency and temperature ranges (1 to 200
MHz, 0 to 200 degrees C), I wonder if your posting should have possibly been in
wreck.audio.  We make polyethylene, polypropylene [note the correct spelling],
and numerous polyesters, by the way.

If you want to spend your money wisely, use the right components at the 
appropriate places in your circuit.  However, I would love to sell you 100,000
uF polystyrene capacitors for your power supplies.;-) [With their inherent high
internal inductance you would still have problems.] Imagine the use of all
low-loss film capacitors in boom boxes too!
                                                Barry
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| |  / /        | |  Dr. Barry L. Ornitz   UUCP:...!rochester!kodak!ornitz
| | / /         | |  Eastman Kodak Company
| |< < K O D A K| |  Eastman Chemicals Division Research Laboratories
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