[sdiy] Phase shifters & Compandor chip availability

[Colin f]

----- Original Message -----
From: "Tim Ressel" <madhun2001 at yahoo.com>
To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, January 07, 2003 8:19 AM
Subject: [sdiy] Phase shifters & Compandor chip availability


> I was interested in the ARP Quadra schematic. Does
> anyone know why a compandor was included? I figure its
> either for noise reduction or dynamic range
> enhancement, possibly both.

Aren't they both the same thing ? ;-)

> Running the signal thru 28
> transistors has got to be noisy.
>
> Has anyone built one of these beasties?

I've built two, using Juergen Haible's PCB layout from
http://www.it.kth.se/~e93_mda/synths/friends/haible/hj_sch.html
It has a very deep, liquid sound.
Juergens PCB foil and component layout didn't quite match.
I fixed the component layout, but can't remember if Juergen updated the one
on his page.
You'll find my fixed version at http://www.colinfraser.com/phaser.htm

Colin f