[Lowfer] high Q caps for lowfer and VLF?

[ToddRoberts2001 at aol.com]

In a message dated 3/18/2009 9:45:41 A.M.  Eastern Daylight Time, 
KY1K at myfairpoint.net writes:
Hi everyone.

It  seems mylar and polystyrene caps are going away at an alarming 
rate, which  make building high Q circuits for LF and VLF more problematic.

Disk  ceramic and especially ceramic SMT caps are small and compact, 
but the  electrodes are less than .001 inch thick, hence they have 
horrible ESR  ratings at LF and VLF. And, the ceramic caps have 
horrible temperature  stability, as anyone who ever tried to use on in 
a timing circuit already  knows.

I need low voltage caps that do not need to carry large ac  currents 
(for receiver front end tuned circuits).
Are there any good to  medium LF/VLF optimized caps on the market 
today, or is that I'm just not  looking in the right places?

Thanks any and all  suggestions.
Regards,Art  
_______________________________________________________
 
Hi Art,
Not sure what you mean by mylar and polystyrene caps are going
away at an alarming rate? Mouser still has a good selection of
polystyrene caps at good prices. Both Mouser and Digi-Key catalogs
are full of Mylar and Polypropylene caps. Murata makes excellent
High-Q Multilayer SMT ceramic caps.
 
73 Todd WD4NGG
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