[sdiy] Aries modulars

[JH.]

Hi Don,

nice to see these documents online now!
I'll download them and see if there's something I don't already
have, when I'm at a computer with higher bandwidth again.

Meanwhile, I checked the VCO page
http://www.leinermedia.com/Aries/AriesSchematics/AR-317s.gif
It's apparently the same drawing as I have, complete with the 
expo converter shown as "U8".
Does any of the other documents shed some light on what U8 exactly is?

JH.

----- Original Message ----- 
From: "Don Tillman" <don at till.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, June 13, 2004 12:30 PM
Subject: [sdiy] Aries modulars


> Hey folks, 
> 
> I had vaguely heard of Aries modulars in the past, but today I
> happened to run into this web site that documents them pretty well.
> Check it out:
> 
>   http://www.leinermedia.com/Aries/AriesHome.html
> 
> Here are the interesting things I learned:
> 
>   1. Dennis Colin, known for much of the design work on the ARP 2500
>      and ARP 2600, was apparently the main designer of the Aries
>      modules. 
> 
>   2. The modules are very ARP-like in design, philosophy, voltage
>      levels, circuit details, etc.  'Not surprising.
> 
>   3. Their VCO is a triangle core, with a parallel sawtooth
>      integrator, thus eliminating any possible glitch in the
>      triangle-to-sawtooth converter at the expense of possible
>      sawtooth level inaccuracies.  This relates to the recent
>      discussion here.
> 
>   4. They have a voltage controlled phase shifter that appears to be
>      the same as the one on the ARP Quadra, but without the noise
>      reduction circuitry.  And it seems to be 10 stages instead of
>      14. 
> 
> Very cool stuff.
> 
>   -- Don
> 
> -- 
> Don Tillman
> Palo Alto, California
> don at till.com
> http://www.till.com
> 
>