[sdiy] variable slope resonant HPF

[jhaible]

-----Ursprüngliche Nachricht-----
Von: Don Tillman <don at till.com>
An: <jhaible at debitel.net>
Cc: <synth-diy at dropmix.xs4all.nl>; <motm at egroups.com>
Gesendet: Freitag, 18. Januar 2002 01:12
Betreff: Re: [sdiy] variable slope resonant HPF


>    From: "jhaible" <jhaible at debitel.net>
>    Date: Thu, 17 Jan 2002 02:04:59 +0100
>
>    One Slope / Resonance pot:
>    ccw end is 6dB/Oct, 12 o'clock position is 24dB/Oct, with
>    practically linear action in between. Turning the knob further
>    clockwise will keep the 24dB/Oct slope, but also adds resonance.
>
> Very interesting!  A variable slope feature on a HPF could be
> extremely useful.
>
> Hmmm... do you implement the variable slope feature by offsetting the
> tuning of the individual stages?  Or do you pan between taps at the
> outputs of the individual stages?

The answers are here:
http://www.oldcrows.net/~jhaible/jh5/jh5.html
(schematics included - scroll down)

Made more tests this evening - works as intended. Even oscillates.

JH.