Odp: [sdiy] polivoks filter

[tania gallagher]

I am planning to clean mine tomorrow (the inside that is),
and give it a quick check up..if anyones interested id be more than happy to
make a couple of pictures of the boards in the polivoks. Just let me
know.......

bart

> I've seen this done unintentionally years ago. It was state
> variable filter made by one of the list members. By simple
> mistake it was working without caps, although caps were
> included in the design, but not really used.
> It sounded basically the same after I redone it to standard
> SVF, but of course tuning range had to be shifted down.
> I reckon capless filter works using buffer stray capacitance
> and variable lag of OTAs dependent on Iabc.
> I don't know what I'm talking here...
> 
> Roman
> 
> ----- Original Message -----
> From: Karl Dalen <karldalen at yahoo.se>
> To: <uzs159 at uni-bonn.de>
> Cc: <synth-diy at dropmix.xs4all.nl>
> Sent: Saturday, October 11, 2003 1:52 AM
> Subject: Re: [sdiy] polivoks filter
> 
> 
>> Exactly, listen here to what designer Vladimir Kuzmin
>> says at http://www.muztech.ru/eng/history.php
>> 
>> quoute; VCF doesn't have any capacitor at
>> all and use only two op amps.
>> 
>> Now, that's interesting! I wonder how this is done!
>> Another interesting thing is the VCA, it has
>> differential outputs!
>> 
>> KD
>> 
>> --- René_Schmitz <uzs159 at uni-bonn.de> skrev: > I wrote:
>>>> The filter caps are not on the filter board, but on the connector
>>> board.
>>> 
>>> Oops, no they're not.
>>> 
>>> --
>>> uzs159 at uni-bonn.de
>>> http://www.uni-bonn.de/~uzs159
>> 
>> 
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> 
> 
> 
>