{ Appropriate tag added ]

Try this...
http://www.glencoe.com/ps/ee/williamson/#

Cheers,
-Neil.



On Sunday 24 August 2003 21:21, fred jones scribbled:
> Hi all,
> I am trying to build a metal detector utilizing a PIC 16F877 and some h=
igh
> gain op amps.  I have really no experience laying out PCBs and I am hav=
ing
> problems with the signal level out of the op amp drifting and unstable
> (bouncing around).  Since the device is working (but poorly due to the
> unstable output problems), I really believe my problems are due to poor
> layout allowing noise to affect the op amps or power components.  I loo=
ked
> around the internet for any tutorials but didn't really find much.  Are
> there any out there that you might recommend?  I found a post on a foru=
m
> from a well known metal detector engineer who stated that designing a P=
CB
> for an all analog metal detector was pretty straight forward however wh=
en
> adding a microprocessor there were lots of room for problems.=20
> Unfortunately he didn't mention what to do about it.  I have been tryin=
g to
> chase this for quite sometime and would appreciate some advice.   If I
> can't figure this out I may have to look into hiring it out to someone =
who
> knows what they're doing :-)
> Thanks,
> FJ
>
> _________________________________________________________________
> MSN 8: Get 6 months for $9.95/month. http://join.msn.com/?page=3Ddept/d=
ialup

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