Suitable capacitor types for Cdom - diyAudio
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Old 16th August 2001, 11:59 AM   #1
Shaun is offline Shaun  South Africa
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Hi, all

Does anyone have opinions on what type of capacitor is suitable as Cdom?

TIA
Shaun
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Old 16th August 2001, 12:30 PM   #2
jam is offline jam  United States
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Silver mica or polystyrene.

Jam
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Old 16th August 2001, 02:15 PM   #3
Shaun is offline Shaun  South Africa
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Thanks, Jam.

What characteristics make silver mica and polystyrene most suitable?

Shaun
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Old 16th August 2001, 02:18 PM   #4
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Jam is spot-on right. Between the two, I'd choose silver mica, not so much for its sonic qualities but because of its tight tolerance and better reliability. Sometimes, polyestyrene caps get quite easily damaged physically or are shorted, if the amplifier goes into oscillation for some reason.

Sonically, both are excellent.
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Old 16th August 2001, 06:45 PM   #5
jam is offline jam  United States
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Shaun,

My first choice is silver mica followed by polystyrene. Sam is correct in saying that polystyrene is not as reliable as silver mica.
Both the types of capacitors have excellent high frequency characteristics. Stay away from ceramics.

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Old 16th August 2001, 07:45 PM   #6
ppl is offline ppl  United States
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I have Heared that silver micas can have Nonlinearities at low voltages. So i would think Polystyrene types to Be safe. But Ya these types are sensitive to abuse and most Board wash solvents, Can indeed short, but i have used them as well as silver Micas for years with good luck on Both. I would be interested if anyone has any info on Silvermicas becoming nonlinear at low voltages?
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Old 21st October 2007, 04:40 PM   #7
Yomanze is offline Yomanze  United Kingdom
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What about Metalised Polyester Film caps? I've not much experience on the matter.
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