[sdiy] Moog-type highpass filter

[Harry Bissell]

Which I have on one of my diy synths... there are separate pots for each
VCO and a master volume after the filter. It was intended for a theremin
so there is ~no~ VCA at all.

Overdriving the ladder gives a nice rounded-off tone, but limits the resonance
a LOT. Low values into the filter gives a clean sound with resonance to self-
oscillation.

kind of what you'd expect...

H^) harry

----- Original Message -----
From: Antti Huovilainen <ajhuovil at cc.hut.fi>
To: Amos <controlvoltage at gmail.com>
Cc: Synth DIY <synth-diy at dropmix.xs4all.nl>
Sent: Thu, 22 Apr 2010 10:49:36 -0400 (EDT)
Subject: Re: [sdiy] Moog-type highpass filter

On Thu, 22 Apr 2010, Amos wrote:

> "LPF that can amplify the (AC) signal  while it's going through the ladder,
> while keeping the whole effect at
> unity gain."
> 
> Do the laws of nature allow such a thing?

I believe it's simply marketing speak for "Add user adjustable gain before 
and after the filter". Aka "drive" control.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova
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-- 
Harry Bissell & Nora Abdullah 4eva