[sdiy] HP from LP ? -> Mother-32

Andrew Simper andy at cytomic.com
Sat Aug 5 07:47:16 CEST 2017

I've never got my hands on an actual 904B, nor built/breadboarded one
myself, but I have done a dsp model of one and it does sound very cool. The
cutoff is modulated upwards when driven, which to me sound really good for
a high pass filter. With a real one you should be able to bodge do your own
resonance circuit, you just need a variable inverting gain amplifier from
x0 to x6 or so and clip that with some diodes or use an OTA for the amp
then add this to the input of the filter and you will have an awesome
sounding 24 dB high pass filter that isn't the cheap hack that Moog seem to
be peddling as a high pass filter. I'm surprised someone hasn't made of
module of this already, I suppose low pass filters are more popular is all.



On 4 August 2017 at 23:54, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:

> On 4.Aug 2017, at 16:27 , Andrew Simper <andy at cytomic.com> wrote:
> > "Hello Andrew,
> > Yes, the 500 Ladder Filter high-pass is created in a similar way to the
> Voyager or Mother-32 high pass, not like the 904B.
> >
> > Well there we have it.
> Thanks for asking!
> I wonder, is the 904B alone attractive anyway? I never had one at hand.
> I read the 904A/B/C combination is nice.
> m.
> --
> http://mz.klingt.org
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