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

Dave Leith dave.leith at gmail.com
Fri Aug 4 06:05:04 CEST 2017


Moog Voyager had both HP and LP and they could be configured to bandpass
with adjustable width. I don't remember what resonance did in bandpass
mode....it's been a while :-)

On Thu, Aug 3, 2017 at 7:52 PM, Andrew Simper <andy at cytomic.com> wrote:

>
>
> On 3 August 2017 at 22:46, Michael Zacherl <sdiy-mz01 at blauwurf.info>
> wrote:
>
>>
>> So, it seems Moog have taken a shortcut as well, to get this "other”
>> filter response?
>>
>> OTOH, the Moog 904B is a true HPF but with no resonance control.
>> Is there a practical reason for that?
>>
>>
> The blurb seems to imply it's a proper moog high pass like the 904B, but
> clearly it isn't by the reviewers comments. Resonance works with the 904B,
> but since the cutoff is increased as the transistor non-linearity is hit
> it's a good idea to limit the feedback signal before it gets sent to the
> input of the filter. In a regular moog ladder the cutoff is decreased with
> the non-linearity. I've modelled a resonant Moog high pass filter in my
> plugin The Drop, it's called PRD HP.
>
> The Moog Ladder 500 module looks like the real deal. It has a hp / lp
> switch, and 12 / 24 dB slope selectors, so I'm guessing this is a proper
> moog high pass. I would love to see the schematic for it since the topology
> of the two filters is quite different - they may just have two entire whole
> filters inside - which would be a shame since you can't use them both at
> once to make a mega bandpass filter.
>
> Cheers,
>
> Andy
>
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