[sdiy] State Variable Filter in AudioXpress

[Tim J]

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...


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> 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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