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'Ceramic vs monolithic caps for xtal'
1995\12\01@160745 by David G. Schmidt

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I am looking for a source for physically small 15pF ceramic disc
capacitors for use in the xtal section of a PIC.  The digikey
catalog doesn't have any that are really small, especially as
small as those found in Radio Shack's low capacitance blister pack (3/16"
diameter).
  Digikey did have some small 15pF monolithic ceramic caps that would be
perfect in size.  Can I use these instead?  Will these work at 4Mhz?

Thanks for the help or an leads.

Dave

1995\12\01@211027 by Andrew Warren

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David G. Schmidt <spam_OUTdschmidtTakeThisOuTspamRAIN.ORG> wrote:

> I am looking for a source for physically small 15pF ceramic disc
> capacitors for use in the xtal section of a PIC.  The digikey
> catalog doesn't have any that are really small

Dave:

Why not use one of those Panasonic resonators with built-in caps?
Digi-Key sells 4 MHz versions for (I think) about 50 cents apiece.

-Andy

Andrew Warren - .....fastfwdKILLspamspam@spam@ix.netcom.com
Fast Forward Engineering, Vista, California
http://www.geopages.com/SiliconValley/2499

1995\12\02@012123 by Shel Michaels

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In a message dated 95-12-01 18:29:38 EST, Dave wrote:

>
>I am looking for a source for physically small 15pF ceramic disc
>capacitors for use in the xtal section of a PIC.  The digikey
>catalog doesn't have any that are really small, especially as
>small as those found in Radio Shack's low capacitance blister pack (3/16"
>diameter).
>   Digikey did have some small 15pF monolithic ceramic caps that would be
>perfect in size.  Can I use these instead?  Will these work at 4Mhz?
>
>Thanks for the help or an leads.
>
>Dave

A couple of times I've used the Panasonic ceramic resonators with built-in
capacitors available from Digikey as P/N PX400, currently selling at 96 cents
by the each.  Never noticed any problems.  You might try them as a small,
convenient source - unless anyone else has had problems with them????

Shel Michaels

1995\12\02@093138 by reginald neale

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{Quote hidden}

I also use the Panasonic resonators. Much, much easier than trying to
stick tiny little in there. You also need about a 1 Meg resistor in
parallel to get reliable starting, with either a crystal or resonator.
In addition to Panasonic, Murata and others make similar resonators.

Reg


....Reg Neale.............standard disclaimer applies.......
"Ignorance is a renewable resource."    P. J. O'Rourke......

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