[sdiy] State Variable Filter in AudioXpress

[BrightBoy]

In the USA, my local Borders Books sells the magazine.

Jeff

-----Original Message-----
>From: Tim J <bob_aloha at hotmail.com>
>Sent: Jun 19, 2008 12:45 PM
>To: David Brown <davebr at earthlink.net>, synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] State Variable Filter in AudioXpress
>
>
>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...
>
>
>----------------------------------------
>> 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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