[sdiy] Dead capacitors

[Harry Bissell]

NP0 (C0G) ceramics are quite good. Its only in recent times that you can get these in larger values.
You might find it hard to get larger values in NP0, but Ian pointed out recently that you can get
up to .22uF in a NP0 ceramic.

check out this Bob Pease article...
http://www.national.com/rap/Application/0,1570,28,00.html

H^) harry

----- Original Message -----
From: dan snazelle <subjectivity at hotmail.com>
To: Ian Fritz <ijfritz at comcast.net>
Cc: Synth-Diy diy <synth-diy at dropmix.xs4all.nl>
Sent: Wed, 11 May 2011 10:21:19 -0400 (EDT)
Subject: Re: [sdiy] Dead capacitors



On May 11, 2011, at 10:01 AM, Ian Fritz wrote:

> 
>> 2. Are DUD poly caps common?
> 
> This one of the things Bob Pease warned about many years ago.  Yes, there are dud polystyrene caps.  I had a batch of bad 470 pF units -- it took me years to figure out why I just couldn't get some circuits to work.  At one point I tried replacing the cap and that was the problem.  It really doesn't make sense to use polystyrene any more.  C0G or NP0 ceramics work just as well, if not better.
> 
> Ian 
> 

So Ian...NPO ceramics will work in critical situations like timing caps?
or filter caps?


thanks

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-- 
Harry Bissell & Nora Abdullah 4eva