AVR-Chat

----- Original Message ----- 
From: "weston54" <weston54@yahoo.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Wednesday, February 14, 2007 3:52 PM
Subject: [AVR-Chat] Re:Tiny2313


> 33pf caps??  The crystal is 10mhz, and stamped right on the package
> from Digikey is that it's rated for 18pf caps.  I'm not sure I
> understand why you recommend 33pf caps.

That is the load capacitance to get the marked frequency, not the value for 
the feedback capacitors.

The capacitors are effectively in series, so you halve the value: 33/2 = 
16.5 pF, plus 1.5 for stray capacitance gives 18 pF.

Leon
--
Leon Heller
Amateur radio call-sign G1HSM
Yaesu FT-817ND transceiver
Suzuki SV1000S motorcycle
leon355@btinternet.com
http://www.geocities.com/leon_heller