Don's interpolating scanner

[Don Tillman]

Happy New Year all!

I've *finally* finished the article I was writing about my
interpolating scanner design.  Enjoy...

http://www.till.com/articles/scanner/index.html

(It was heavily inspired by Juergen's work and benefits from
at least a couple of his suggestions.)

The basic idea is to build an N-way diff amp circuit to drive the
current-controlled amps, taking advantage of the symmetrical
exponential transfer characteristic for a smoother transition between
the inputs.  It also has a pretty low parts count.

  -- Don