[sdiy] Keio TS201012

[JH.]

> In case anyone with a fondness for the filters in the miniKorg 700, 700S
and
> 800DV decides to un-pot one of the Keio ICs and reverse engineer the
> circuit, I'll save you the bother.
> It's identical to the transistor buffered diode ring in the Korg 770
> filters.
> Only difference is that the 770 uses diode arrays instead of discrete
> devices and doesn't have the cutoff range shifted by the octave selector
> switch as on the 700(S).

Excellent work, Colin.

It's what I had suspected, but never could be sure about, until now.

JH.