[sdiy] some diy: ssm2040 filter

[JH.]

> I've been idly wondering if one couldn't take the gain cell sections and
> re-arrange them into other configurations (SVVCF for example) as could be
> done with the original SSM2040.  JH, Rene, ever tried this?

Sure. It's designed to behave like a 2040, after all. 8-)

JH.



>
> Cheers,
> Scott
>
>
> ----- Original Message -----
> From: "ryan williams" <destrukto at cox.net>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Tuesday, September 06, 2005 7:32 PM
> Subject: Re: [sdiy] some diy: ssm2040 filter
>
>
> > sucess,
> >
> > thanks to an off list message from Tim Stinchcombe I now have a properly
> > working filter. and it sounds great!  I love the distorted sound.  I
> > didn't think to check how much bias current sets the cutoff to 20KHz.  a
> > combination of that and the limiting resistor wasn't big enough (and I
> > made it even smaller trying to fix it. heh).  Atleast I was working in
> > the right part of the circuit though. so the pop sound was when the ota
> > bias current was going from a few hundred uA to some mA with a tiny
> > touch of the pot.  I didn't realize that it was going beyond the audio
> > range because the pot was so sensitive.  I changed the offset resistor
> > and it works great now.  I feel a bit silly though.
> >
> > thanks for all the help and suggestions!  just a few more input/output
> > and feedback gain resistor changes and it will be going perfectly.
> >
> > ryan williams
>
>