[sdiy] S&H

[Paul Maddox]

Rainer,


> When I look at the schematics of the early Ensoniq synths I don't see any
> S&H stage for the audio line; the analog out of the sound chip is
> time-multiplexed and serially spitting out up to 32 oscillators which are
> routed through a 4051 getting strobe and the channel address to meet their
> destination CEM3379. At their signal inputs you'll find a small lowpass
> (680R, 0.1uF) as opposed to the 68k series resistor mentioned in the
> 3379's data sheet.

yep, I noticed that, but if you think about the way the ensoniq does it, it
mixes the waveforms using time-division.
for example, at any given instant you have only one of the 3 oscillators at
the input of the filter, not the sum of all 3...

I've thought about it, and Im not sure how well that would work...

Time to have a play...

Paul