Polyester, Polyprop, Electrolytic - Quick and Informal - diyAudio
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Old 14th June 2006, 01:08 AM   #1
bigphil is offline bigphil  Canada
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Default Polyester, Polyprop, Electrolytic - Quick and Informal

Is it always better to replace an Electrolytic with a Polyprop or Polyester, can chaning an electrolytic with a polyester do any harm? Or is it not worth the trouble at all?

EDIT - to be more specific, I searched and a lot of people say that polyester "sucks" but I want to know if its worth the time/money to change them out where it will work for electrolytics.
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Old 14th June 2006, 01:29 AM   #2
anatech is offline anatech  Canada
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Hi bigphil,
Replacing electrolytics with polyesters is normally fine. Polyester caps are way better than electrolytics in the same value. Polycarbonate are better, Polypropylene and Polystyrene are better still.

Todays electrolytic caps are far better than the older ones from the 70's.

Don't ever replace caps in tuned circuits (like CD servos and tuners), you will regret it. The same holds true for metal film resistors. I've seen more than one unit written off by being "modded".

-Chris
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Old 14th June 2006, 01:32 AM   #3
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one app where you should think twice abouuuuut (that's CDN for those who speak the non-anglais) changin' the cap is in an low dropout regulator -- these have to be designed with the ESR of the cap in mind.
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Old 14th June 2006, 01:42 AM   #4
bigphil is offline bigphil  Canada
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Thank you very much.
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Old 14th June 2006, 01:43 AM   #5
anatech is offline anatech  Canada
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Hi jackinnj,
Thanks, didn't know that. I normally don't work by replacing things wholesale (thank goodness). Engineers often have reasons for the things they do - even if it's a mistake .

-Chris
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Old 14th June 2006, 01:52 AM   #6
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I am head'n up to Pelee Island this summer, fwiw
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Old 14th June 2006, 02:09 AM   #7
anatech is offline anatech  Canada
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Why would you do that? Unless you like wine of course ...
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Old 27th June 2006, 01:01 AM   #8
KBK is offline KBK  Canada
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don't they have a bad airport there too?
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