more rack ideas

[John Speth]

At 12:33 PM 4/30/97 -0400, you wrote:
>Be warned as I was, ribbon cable is only capable of carrying about 100ma per
>wire.  If I remember right, its like 26 or 28 gauge wire.  If you are doing
>a number of modules, IDC connectors and ribbon cable is a very easy and
>clean solution, but it just is not capable of carrying enough current.

It's hard to resist the clean packaging of ribbon cable.  So in dealing
with the limited current carrying capability of ribbon conductors, you can
always double or triple up the high current conductors to increase the max
current for a particular signal.

Also I'm not 100% sure about this but I *think* you can reduce signal
crosstalk in a ribbon by positioning a grounded conductor between signal
conductors.  I've seen this done with digital signals but I would imagine
the same theory applies to analog as well.

John Speth (johns at oei.com)
Object Engineering, Inc.
Vancouver, WA