What type AC coupling capcitors do you use for input and output stage? - diyAudio
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Old 15th September 2012, 10:53 PM   #1
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Default What type AC coupling capcitors do you use for input and output stage?

What is the best type of capacitor for AC coupled input and AC coupled output? I'm assuming polarized electrolytics are not the best type.
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Old 16th September 2012, 12:29 AM   #2
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Teflon or polystyrene. But they are BIG! Regards
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Old 16th September 2012, 01:22 AM   #3
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I use polarised electrolytics and have no problems.
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Old 16th September 2012, 02:15 AM   #4
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I am about to use AC mains power motor capacitors.
Reasonably priced with excellent electrical properties but probably best to hide them because people will inevitably think that such an industrial component must sound industrial.

Best wishes
David
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Old 16th September 2012, 02:40 AM   #5
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Those are ususally metalized polypropolene and can sound very good. I do not use in the signal path, however, only in the ps. If you need high value in a small space, try niobium oxide. They are only as SMDs however. Regards
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Old 16th September 2012, 04:36 AM   #6
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Just to make it clear, I'm talking about ac caps in the signal path, as coupled input and ac coupled output.
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Old 16th September 2012, 04:56 AM   #7
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I understand your question.The best is any film and foil-teflon first, then polystyrene, then polypropolene. I would avoid mylar or any electrolytice unless absolutely necessary. What values do you need? What size can they be? You really need to specify those two parameters before the question can be fully answered. Regards
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Old 16th September 2012, 06:05 AM   #8
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Some people would disagree MKP (Polyprop) over MKS (Polystyrene).
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Old 16th September 2012, 06:35 AM   #9
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Not to derail the thread, but could someone remind me what Mylar's are? Are those the same as polyesters?
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Old 16th September 2012, 06:41 AM   #10
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Mylar is polyester yes.

I don't know how Teflon or polystyrene are very useful for coupling, they are barely available and in tiny values. For normal solid state equipment input Z the best you will find is probably metalized polypropylene (easily available up to <100 uF). Failing that, try a very large value bi-polar electrolytic like Nichicon Muse ES or Panasonic SU.
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