[sdiy] CMOS for linear circuits.

[Paul Perry]

----- Original Message ----- 
From: "ryan williams"
> Whats the deal with this. I expect there might be some coupling between
> gates on the same chip? I have not experienced something like this but
> only read people mentioning that kind of problem. So when is it ok to
> put them on the same chip, and when should they be seperate? maybe it's
> a complicated question. if so, what books to read?
>
even after reading the books, it's pretty much a 'suck it and see'
situation.
I notice on the glasgow theremin circuit, there is a note saying to do the
layout the way they say. That (in my experience) is code for "we spent
weeks hacking around until we gave up & used separate chips & fluked a
layout that kind of works".
So I would definitely just copy theirs as close as you can. The chips are
like 20 cents each, after all.
I never got the glasgow theremin to work very well myself.
I went optical instead.

paul perry Melbourne Australia