AW: EMS Supreme !

[Haible Juergen]

	>I've found some nice mod pots(Allen Bradley) at a surplus
center that 
	>are physically smaller for $0.50 ea.I'm trying to swing a deal
with 
	>the owner to buy out the lot.

For my JH-3 Modular I had bought nice RadiOhm Pots for
less than DM 1,- ($0.50), and that was *including* knobs. !
Unfortunately, this source isn't available anymore. But if
you buy in hundreds, it's not unlikely to get similar deals.

	>Also ,anyone building such a beast SHOULD buffer both ends to
avoid 
	>interaction when making your settings.Hinton Instruments has
details 
	>on this on their EMS mods section of their site.

Yes, that's the least thing you can do.
I'd even consider routing separate GND lines to each column
of potentiometers, to avoid crosstalk over a common GND line.
Noise would be an issue as well: On the EMS, you only have
a few pins plugged in at a time, but with the potentiometer
matrix, thermal noise from unused inputs would contribute
as well.

	>Hinton have a nice cct. for 
	>this if needed.

Yes, Graham Hinton has very good information on his page.
And his famous "Myths" page helped me to look at certain
things differently. 

	>I've got plenty of other EMS goodies in store so stay tuned
hardcore 
	>fans.

Tell us all you know ...

JH.