Touch Kbds

[A.S.P.]

The circuits in the book are based on Buchla series 100 modules.  They 
are simplified versions, but I believe he Thomas uses these standards 
because Buchla did.

Romeo


On Fri, 31 May 1996, Dan Higdon wrote:

> Yeah, I have this book.  It's kinda interesting.  The thing I didn't like about it
> was that Mr. Thomas decided to go with a very non-standard, wacky control
> voltage scheme.  He uses 0 to 15v linear (V/Hz) controls for everything.  Granted, he
> does give an exponentiator schematic near the back of the book, but all of
> his modules seem to be linear.
> 
> I have built (proto only) his resonant filter (4 pole, BP), and it works ok
> (linear CV response, natch), and his sequencer seems to work as well, though
> I haven't tried to build out a whole sequencer yet, just a proto of the LED flashing
> part. :-)  Oh yeah, and I proto-ed the VCO as well, and it works just fine for
> a linear-control VCO, although I didn't really hammer on it since I don't have
> a linear-control keyboard. :-(
> 
> If you don't mind doing a little extra design, the schematics look fairly sound
> and simple.  After studying transistor design a little (he does almost everything
> with trasistors and special purpose ICs, not opamps), some of his designs seem
> a little screwy, but I admit I'm no electrical engineer. :-)
> 
> Because of the v/hz control, I haven't built any Thomas designs fully, because Wally
> is working from 0-5 v/octave controls, and "he" won't talk to other standards happily.
> 
> Later,
> Dan Higdon (hdan at charybdis.com)
> 
> ----------
> From: 	Joe Farler[SMTP:joef at roland.co.uk]
> Sent: 	Friday, May 31, 1996 9:27 AM
> To: 	synth-diy at horus.sara.nl
> Subject: 	Touch Kbds
> 
> Just to let the list know that there is a design for a simple touch keyboard in
> a book I recently borrowed.  There are also some other interesting synth
> circuits. Here's the info:
> 
> "Sound Synthesis - Analog and Digital Techniques" by Terence Thomas
> 
> First published 1990 by TAB books.   ISBN 0-8306-9276-2 ( hardback )
>                                        or 0-8306-   9276-x ( pbk )
> 
> Has anyone out there built any of the circuits in this book?
> -- 
> Joe Farler
> joef at roland.co.uk
> 
> 
> 
>