AW: original and ingenious circuits ... (was: in How the heck doe s the MS-50 filter WORK?)
Juergen.Haible at nbgm.siemens.de
Thu Jul 23 12:18:55 CEST 1998
[great description of Eventide omitted]
>The LFO in the EH SmallStone is a nice one as well, it is based
>one CA3094. Hell, I like the rest of the SmallStone as well, I just
>lack a few features...
Very nice circuit. I remember that Don has mentioned the direct exponential
voltage control of 3080's a long time ago, and while it was clear to me that
it could work in theory, I hesitated to consider it practically useful ...
until I saw the Small Stone schemos.
As fas as I understood it, the Iabc inputs of the all pass otas are driven
a *voltage*, while the trigger thresholds of the hysteretic switch are
the according *current*. So the modulation depth is temperature
compensated. Very nice indeed.
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