5pole diode filter (was:Re: Re(2): [sdiy] Another CV breakthrough question)

[Magnus Danielson]

From: jhaible at t-online.de (jh.)
Subject: 5pole diode filter (was:Re: Re(2): [sdiy] Another CV breakthrough question)
Date: Sun, 20 May 2001 20:58:27 +0200

> > And there were two versions of the filter board. I have schems with both
> > filter boards, but the only real difference is that one uses the moog
> > ladder and the other uses the diode/transistor ladder. The diode ladder
> > filter is the same as the Sys-101/102, but the diff amp is the same
> > horrible one opamp thing. They must have learnt about better diff amps
> > by the time the much better System-100 came out. The Sys-101 uses the
> > same discrete diff amp as the TB303 more or less.
> >
> > Now the Sys-101 is one of my favourite synths, so I'm keeping the diode
> > ladder filter in my SH-2000. However, I think I am going to match the
> > transistors better in the ladder to get rid of the that CV breakthrough.
> 
> 
> So the System 100 has a 5-pole diode ladder, too - I didn't know that.
> The SH-5 has it as well if memory serves.
> Guess I have to build one of these, too - never tried it so far.

Count in SH-1000. I just had the schematics given to me earlier this
week and one of my friends have one... hmm... maybe time to make some
measurements and listening...

Cheers,
Magnus