What type AC coupling capcitors do you use for input and output stage? What type AC coupling capcitors do you use for input and output stage? - diyAudio
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What type AC coupling capcitors do you use for input and output stage?
What type AC coupling capcitors do you use for input and output stage?
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Old 15th September 2012, 09:53 PM   #1
Fusion916 is offline Fusion916  United States
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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 15th September 2012, 11:29 PM   #2
john dozier is offline john dozier  United States
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Teflon or polystyrene. But they are BIG! Regards
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Old 16th September 2012, 12:22 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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I use polarised electrolytics and have no problems.
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Old 16th September 2012, 01:15 AM   #4
Dave Zan is offline Dave Zan  Australia
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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.

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David
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Old 16th September 2012, 01:40 AM   #5
john dozier is offline john dozier  United States
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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, 03:36 AM   #6
Fusion916 is offline Fusion916  United States
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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, 03:56 AM   #7
john dozier is offline john dozier  United States
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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, 05:05 AM   #8
KatieandDad is offline KatieandDad  United Kingdom
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Some people would disagree MKP (Polyprop) over MKS (Polystyrene).
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Old 16th September 2012, 05:35 AM   #9
Rod Beauvex is offline Rod Beauvex
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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, 05:41 AM   #10
chris719 is offline chris719  United States
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What type AC coupling capcitors do you use for input and output stage?
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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