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Old 11th January 2002, 05:03 PM   #1
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Default Silver Mica for bandwidth limiter

Does anyone see a problem (audible) with using a Silver mica 220pF cap for use as a bandwidth limiter in an active filter.
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Old 11th January 2002, 06:55 PM   #2
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I regard Silver Micas as the best cap you can get
as long as it holds the value tolerance you want.
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Old 11th January 2002, 07:13 PM   #3
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Default Thanks!

Hello Nelson,

Thanks again for your very timely post and help.
Glad to have you out in the ether...

Best Regards,

Dale
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Old 7th April 2002, 06:39 PM   #4
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Hi,

isnt it a problem that the silver micas are magnetic ?

There are non magnetic mica versions too.


Bernhard
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Old 7th April 2002, 06:50 PM   #5
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Default silver mica

Why use this when there is plenty of choice of pp film and polystyrene capd available. To me these sound better unless you but the very expensive Soshin ones.
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Old 7th April 2002, 07:35 PM   #6
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Nelson:

Have you been talking to Paul McGowan again? [joke]

Jocko
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Old 7th April 2002, 09:34 PM   #7
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Default There is nothing wrong with using mica caps.

Small value silver mica caps are excellent compensation caps to control high frequency roll off or to provide high frequency boost in most any applications. I use silver micas for such use in all of my designs in which I can keep the capacitor valued below roughly 220pf. In applications where higher capacitance values are required and extremely good characteristics into the upper VHF frequency range is not required then I prefer to use polystyrene types.

Donít use ceramic types under and circumstances in the signal paths since they can produce strong harmonics when AC currents are flowing through then.

John Fassotte
Alaskan Audio
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Old 9th April 2002, 09:24 PM   #8
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Sorry, the joke appears to have passed through
one of the holes in my consciousness without being
apprehended.
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Old 10th April 2002, 12:26 AM   #9
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Default McGowen and silver micas

Paul McGowen was a fan of silver micas. I guess Mr. Pass's knowledge off his contemparies feedback preferences may not extend to capacitors. To be fair, capacitor preference is a rapidly moving target in audio. Jocko hates them because the tempco goes all over the place and he is an old ham radio guy that built circuits that can't drift with temperature for radio applications. They do have low ESR and series inductance but have lousy D.A. perfomance and temperature stability. I like polystyrenes sound better and my local surplus store has a great stash of small P.S.(and silver mica) caps.

H.H.
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Old 10th April 2002, 06:35 AM   #10
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Default Was a fan?

As far as I know, he still is. Haven't talked to him in quite a few years, but I doubt he has changed much.

Jocko
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