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

[Sean Ellis]

I'm surprised they aren't doing something similar to the HP input schematic I posted, it sounds fantastic for a few extra components. I could do some recordings of it in an actual ladder rather than the diode ladder in the 303.


________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Andrew Simper <andy at cytomic.com>
Sent: Saturday, 5 August 2017 3:47 PM
To: synth-diy mailing list
Subject: Re: [sdiy] HP from LP ? -> Mother-32

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.

Cheers,

Andy

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

On 4.Aug 2017, at 16:27 , Andrew Simper <andy at cytomic.com<mailto: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.
> Thank you, NOAH JOLLY SERVICE DEPARTMENT TECHNICIAN"
>
> 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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