On Mon, 06 Jul 2009 11:32:27 +0100, Jim Lesurf
wrote:

That is so. I use cookbooks for such purposes. FWIW I've put some of the
simpler design rules on the web at

http://www.st-andrews.ac.uk/~www_pa/...rt3/page2.html

The snag is that we still don't know the signal levels, impedances, etc,
that would suit John's requirements.

Well, given the job it is to do, I doubt that levels are important
unless they are so high they cause overload - easily dealt with. And
for impedances, my normal way is to make the input high and the output
low; you seldom go far wrong that way.

d