AVR-Chat

nangkon,

I would recommend that you get a basic book on electrical networks and 
basic electronics technology.  I'm sorry but most of my books on that are 
fairly old, so I can't recommend a good one now.  You could find something 
like this almost anywhere  -- a used bookstore, even Radio Shack.  Just 
something with tutorial on electrical components and the theory behind 
electrical circuits and loops.

You will need to understand this to do anything useful, otherwise the first 
time that something doesn't work as expected, you will have no way of 
figuring out what is wrong, and as you are finding here, you won't be able 
to compute circuit parameters that you need.  The understanding of circuits 
is important because whether it is a resistor, cap, or diode, the basic 
circuit flow follows the same principals, just different behaviors with 
respect to time and thresholds..

If i get time i will look around and if i see a good tutorial, i'll send it 
to you.

cheers,
jeffrey



At 03:47 AM 11/21/2003 +0000, nangkon wrote:
>Thanks for the info!
>
>Is there an instrument (maybe Oscilloscope) to measure
>if the cap/crystal combination is ok? And what should
>I measure (frequency)?
>
>I really want to learn this so that I can apply the
>same technique for other scenario or for other chips.
>
>Anyone can point me to tutorial or web page how to
>use cap in general. I can understand resistor, but
>cap usage is still like a black magic to me when
>I look at different schematics.
>
>thanks
>
>
>
>--- In AVR-Chat@yahoogroups.com, Mike Harrison <mike@w...> wrote:
> > On Thu, 20 Nov 2003 19:44:59 -0000, you wrote:
> >
> > >I saw a lot of schematics that use 2 capacitors with
> > >crystal that is connected to XTAL. Is there a way
> > >to determine the appropriate values of capacitors?
> > >
> > >Do I need to use some equipments to do that? Or is
> > >there a general rule somewhere?
> > >
> > >thanks in advance
> >
> > 27pf will be OK in most cases
>
>
>
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