looking for ring mod

[Tim Walters]

At 11:24 PM 9/5/98, Hess Hodge wrote:
>I was looking at some of the proposed face-plates for the ASM-1, and there
>was one by Tim Walters that features a Ring-Modulator modification (that
>features a switch to go from multiplication to division).  After a few
>failed attempt at finding this circuit on the web, I have turned to you...
>If anybody could provide me with information, I'd be very grateful...

Hess and all,

This front panel was an early design that has turned out to be ridiculous
in many ways, so don't put too much stock in it... my final design turned
out to be seven rack spaces instead of three, for example.

As far as the ring mod goes, I used the pricey but butt-simple AD634 chip.
The app notes for this chip show a configuration in which it acts as a
divider, and I planned to build it in such a way that I could switch
between multiplication and division.  I still haven't done it, so I don't
know if it works or what a divider would sound like.  Since it's going to
hit the power rails at every zero crossing in the y-input, I imagine it
would be quite gnarly; I like horrible noise, so no problem, but I doubt it
would be all that useful for conventional musical purposes.

My knowledge of circuitry and synth-building is sub-rudimentary (which is
why I lurk and learn on this list, although most of it is way over my
head), so if anyone wants to correct any of the above, feel free!

Tim Walters
coredump at slip.net