> 1) Use one 8 bit A/D converter, with a switch in the analog input
> (that i still don't know how it would be done) controled by a pin,
> that selects if we're reading alanolg input 1 or 2 in the same
> converter.  But what kind of switch? Could not one analog input
> leave something that interferes in the other?

http://home.clear.net.nz/pages/joecolquitt/mixer.html

This is something I played around with and got good results. The
TLC549 is a cheap fast reliable A2D. I haven't had time to have a
second look at it (it's just a proof of concept idea) but perhaps it's
a method you could optimise for your own signals. You don't need
the pots+diodes for instance. Another way to do it would be with
a 4066 and two TLC549s. I think you should be able to use shared
lines (except Data) to two A2D convertors

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu