[sdiy] matrix ICs

[THOMAS, Mervyn]

Paul/Paul;

I have also been looking at crosspoint switches as an alternative method of
patching. There's a circuit/project on the web by Steve Ciarcia (the Circuit
Cellar guy) for an 8 channel audio matrix AND an 8 channel video matrix in
the same box. Other parts of the project include IR remote control - &
computer control. Try a search on [IFIRC] 'avmux'.

I guess this means that video and audio are NOT interchangeable??? Biggest
problem I can see for the average DIYer is that these devices are high pin
count which means fine pitch SMDs - should be fun to solder. Also probably
quite expensive but cheaper than a patch matrix panel and more elegant
[IMHO].

BTW: Running this email through the spellcheck in Outlook brings up 'sods'
for 'SMDs' - says it all really dunnit...


Merv Thomas
UNIX CAE SysAdmin - Portsmouth
*Email:	mervyn.thomas at astrium-space.com
*Tel.:	 +(0)23 9270 5394 
 * Fax.:	 +(0)23 9270 8663


-----Original Message-----
From: Paul R. Higgins [mailto:higg0008 at tc.umn.edu]
Sent: 05 October 2001 04:59:AM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] matrix ICs


I was wondering if any DIYers have experience with the various crosspoint
matrix
ICs.  I'm most familiar with the ones made by Mitel, although I know that AD

also makes them, as does Intersil.  I also recall that someone (Harris?)
makes 
an 8 x 8 matrix as part of their HC/HCT line.

My main interest in these ICs is, of course, audio applications (not
necessarily
of an exclusively synth nature).  I could see an application for CV matrices
as 
well if they were sufficiently linear.

The most recent matrix IC I found was on the Intersil website; here's the 
datasheet URL for those who want to take a look:

http://www.intersil.com/Data/FN/FN4/FN4153/FN4153.pdf

This is an 8 x 8 "video crosspoint switch", the HA456.  I haven't had a
close 
enough look myself to tell whether it is suitable for audio.

If anyone has built anything with these devices, I'd love to hear about it!

Thanks,
-PRH

_____________________________________________
Paul Higgins
email: higg0008 at tc.umn.edu
University of Minnesota
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