[sdiy] State Variable Filter in AudioXpress

[Roy J. Tellason]

On Thursday 19 June 2008 12:45, Tim J wrote:
> anyone have a copy of this article?  Looks like the only way to get it is
> to buy the magazine or subscribe to the mag for a year.  I dont really want
> to sub and I dont know of any place that carries it...

Ditto...

> ----------------------------------------
>
> > Date: Wed, 18 Jun 2008 19:47:14 -0700
> > From: davebr at earthlink.net
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: [sdiy] State Variable Filter in AudioXpress
> >
> > There's a 14 page article in this month's AudioXpress on a State
> > Variable Filter design by Dennis Colin, designer of the original ARP
> > 1047 filter.  This design is for a stand alone filter for speaker
> > testing.  I thought his temperature compensation was interesting.  He
> > used a diode and two regulators to compensate the control voltages
> > and includes data on the stability.  Full schematics for a 20 - 20
> > KHz filter with adjustable Q of 0.5 to 100.  Nicely written.
> >
> > Dave


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