[sdiy] lin to log envelope

[Scott Stites]

Hi Peter (and List),

I haven't had the chance to try it, but it seems to me that I read somewhere
that you can get somewhat of the same effect using a VCA(?)

Iirc, you split the output of the EG so that one output is passing through
the VCA, while the other output is controlling the VCA.  Did I dream this,
or is it a doable thing?- I'm kinda fuzzy on it, and I'm not set up to try
it now....

Cheers,
Scott


----- Original Message -----
From: "Peter Grenader" <peter at buzzclick-music.com>
To: "gregory zifcak" <zifcak at hotmail.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, November 18, 2003 4:49 PM
Subject: Re: [sdiy] lin to log envelope


> If your envelope phases are VC'able, its cakewalk - output of envelope
into
> VC input.  If it's not, then well...you're going to have to do some
cutting
> and hacking to get it in there.
>
>
>
>
>
>
>
> gregory zifcak wrote:
>
> > hello,
> >
> > i saw in the archives a reference to changing the shape of envelopes by
> > feeding them back into themselves either positively or negatively. does
this
> > refer to the positive and negative inputs of the opamp?
> >
> > my application is this:
> > i have a simmons sds800 which uses cem3394 chips for osc-vcf-vca.
according
> > to the datasheet, the vcas are approximately exponential, allowing
> > exponential volume shapes with a linear envelope. i am assuming that the
> > simmons envelopes are linear or maybe even exponential, because they are
not
> > particularly punchy. i would like to make them logarithmic if possible
in
> > order to obtain punchy, linear dynamic response.
> >
> > so basically my question comes down to where do i feed(back) the output
of
> > the envelope?
> >
> > thanks for any info,
> >
> > greg
> >
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>
>