[Boatanchors] Disc caps vs paper caps

[Richard Knoppow]

----- Original Message ----- 
From: "J. Forster" <jfor at quikus.com>
To: "Mark Foltarz" <Foltarz at rocketmail.com>
Cc: "Boatanchors at mailman.qth.net" 
<boatanchors at mailman.qth.net>
Sent: Wednesday, September 26, 2012 7:29 PM
Subject: Re: [Boatanchors] Disc caps vs paper caps


Probably true, but many ceramics are piezoelectricand can 
have a pretty
large voltage coefficient of capacitance.

I can't think of any reason they'd not work offhand though.

-John

     The class of dielectric makes a difference.  Zero 
temperature coefficient dielectric, marked NP0 or C0G (the 
0's are zeros) AKA Class 1 dielectric, have little 
piezeoelectric effect and low voltage coefficient of 
capacitance.  They have the lowest dielectric constant so 
are large in comparison to other ceramic types.  Hi-K 
ceramics are popular for surface mounting and other 
applications where size is important but even low-K ceramics 
are small in comparison to old style paper caps.  They have 
the advantage of very long life and very stable operation. 
There are some very specialized uses where they should not 
be used but those are very few.  They will work very well 
for replacing the vibrator caps and will probably last for 
ever.  They are available in higher voltages than film caps.

For more see:  http://my.execpc.com/~endlr/ceramic.html


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com