I copied the capacitors into the crystal circuit from one, working connecti=
on that also used the=20
same PIC as I do..
Where should I put any other( load ) capacitors?And what capacity size?
Thanks again for help
L.




> OK, fine.
>=20
> We'll know better when we have more info about the
> actual "ciruit". Right know the best guess is that
> load capacitors for the crystal are missing.
>=20
> If the caps are missing, just add them.
>=20
> Jan-Erik.
>=20
>=20
> jim wrote 2011-11-05 16:16:
> > Disregarding your sarcasm, I was just stating why capacitors are used i=
n a
> > crystal circuit.
> > Whether they are included in the circuit in question is as you say an
> > unknown.  But for the
> > point I was trying to make, it doesn't matter one way or the other.
> >
> > As far as it being a problem if they aren't included in this particular
> > circuit?  Of course
> > it could be.  No one said, at least certainly not me, that it wouldn't =
be a
> > problem.  As a
> > matter of fact, my comment only supports the fact that it could be a
> > problem, not dismisses it.
> >
> > And now regarding your sarcasm, I don't appreciate it at all.  I was ju=
st
> > trying to make a
> > circuit design point.  I was not trying to start an argument.
> >
> > Regards,
> >
> > Jim
> >
> >
> >
> > -----Original Message-----
> > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behal=
f Of
> > Jan-Erik Soderholm
> > Sent: Saturday, November 05, 2011 8:38 AM
> > To: Microcontroller discussion list - Public.
> > Subject: Re: [PIC] IS this faulty?
> >
> > OK, whatever.
> >
> > We don't know for sure if there are any capacitors or not.
> > And if not, isn't it a possible "problem" ?
> > I think it is.
> >
> >
> > jim wrote 2011-11-05 14:53:
> >>
> >> The main reason for the capacitors in a crystal circuit is to provide =
an
> >> intentional imbalance between the input of the oscillator and output p=
in
> > of
> >> the oscillator so that when power is applied, the imbalance causess
> > current
> >> to flow, and thereby guarantees the oscillator will start oscillating.
> >>
> >> Jim
> >>
> >> -----Original Message-----
> >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Beha=
lf
> > Of
> >> Isaac Marino Bavaresco
> >> Sent: Saturday, November 05, 2011 7:45 AM
> >> To: Microcontroller discussion list - Public.
> >> Subject: Re: [PIC] IS this faulty?
> >>
> >> Em 5/11/2011 10:57, Jan-Erik Soderholm escreveu:
> >>>>> I *think* that the header is useless without a target circuit.
> >>>> But what is the smallest target circuit?I thought adding only crysta=
l is
> >>>> OK for starting debugging
> >>> Right, but a crystal is useless without capacitors. And it is
> >>> a bit unclear how the header is powered.
> >>
> >>
> >> Not exactly. It may become unstable, or not to oscillate at all, but i=
t
> > may.
> >>
> >>
> >>>> Sorry, I have just only  started with microchips  - so a lot  of new
> >>>> knowledge for me to learn.
> >>> It's not about learing PICs, it's about telling everything and
> >>> not hiding details. :-)
> >>
> >>
> >> By my experience with teaching newbies in electronics and
> >> microcontrollers, it takes time to notice that there's missing
> > information.
> >> Because of this, I generally take it easy with them.
> >>
> >>
> >> Isaac
> >>
> --=20
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> http://mailman.mit.edu/mailman/listinfo/piclist


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