[sdiy] xr2206

[Scott Stites]

> Someone has a web page "Birth of a Synth". It mentions an XR2206, but I
> couldn't find any details.


That would be my page.  This summer I was beta testing some circuits for
Thomas for a book he'd hoped would be out now, only life (actually a heavy
duty teaching schedule) got in the way.  He sent me a manuscript of it, and
it's full of pretty cool stuff concerning the XR-2206.  Hopefully he'll pick
back up on during summer hiatus.  BTW, he was working on another book (the
manuscript I have was about 566's, 8038's, XR2206's) about more general
synth circuts - hope that one comes out, too.  I've tested some circuits
from it, and they were pretty good.

In the meantime, I got sucked into other things, the VCO's expo converter is
on protoboard, and I just haven't gotten back to testing the brass tacks on
it yet, which I should.  Part of my agreement with TH wasn't to publish any
of the schemos, so that's why there's so little info.

As for the XR2206, don't overlook the balanced modulator =0)

Another thing - the below message was posted a couple of weeks ago and
passed with hardly a ripple, but I certainly enjoyed it.  Not the XR-2206,
but the XR2207 (see below)

Cheerio,
Scott

----- Original Message -----
From: "James J. Clark" <clark at cim.mcgill.ca>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, January 10, 2005 7:15 PM
Subject: [sdiy] XR2207 VCO


> Hi everyone, this is my first post here, but some of you may know me from
> the Nord Modular or Reaktor lists.
>
> I have been working on a number of DIY projects building some Doepfer
> format modules. I have the details (some still sketchy) on my web page:
> http://www.cim.mcgill.ca/~clark/emusic.html
>
> One module that might interest you is a VCO based on the XR2207 VCO
> chip. I had a bunch of these lying around and thought it would be fun
> to try and make these into a synth VCO. As it turns out, they make quite a
> respectable VCO, with a very high quality triangle wave. The linearity is
> sufficient for synth purposes. I have some comparison of the VCO with the
> Doepfer A-110 on my web site.
>
> Of course, any comments would be welcome!
>
> Jim
> clark at cim.mcgill.ca
>