FW: [sdiy] Aftertouch via Pressure

[Gene Stopp]

Hi DIY,

Honoring Dana's request...

Velostat looks like ordinary black plastic sheeting. It's about 6 mils
thick. It was made for antistatic purposes, it was primarily
used to make plastic bags to store electronic stuff. It is plastic that is
coated with a conductive carbon compound on one side. It
will easily register on an ohmmeter.
I worked at ARP from 1974 to 1980.
-Dana

ARP from '74 to '80? *That* should have been interesting...

- Gene


-----Original Message-----
From: Dana Scott [mailto:turbo at mustangs.com]
Sent: Thursday, July 10, 2003 4:50 PM
To: Gene Stopp
Subject: Re: [sdiy] Aftertouch via Pressure


Hi,
for some reason I can receive sdiy posts, but my posts to the list never
make it.
If you could forward the info to the list I would be grateful.
Thanks,
-Dana

----- Original Message ----- 
From: "Gene Stopp" <gene at ixiacom.com>
To: "'Dana Scott'" <turbo at mustangs.com>
Sent: Thursday, July 10, 2003 7:00 PM
Subject: RE: [sdiy] Aftertouch via Pressure


> Thanks! It's good that somebody knows this stuff - knowledge should be
> shared! Were you involved with ARP? And, is Velostat one of the standard
> types of CMOS foam, or was it hard to come by?
> 
> - Gene
> 
> 
> -----Original Message-----
> From: Dana Scott [mailto:turbo at mustangs.com]
> Sent: Thursday, July 10, 2003 3:56 PM
> To: Gene Stopp
> Subject: re: [sdiy] Aftertouch via Pressure
> 
> 
> To be precise, ARP used a 3M product called Velostat with a 1/4 inch piece
> of foam on top of it. The Velostat would be compressed
> across a piece of thin pc board material with a narrow gap running the
> length of the keyboard. The adhesive tape that attached the
> Velostat to the pc board served as a spacer to insure that there would be
no
> contact when no pressure was applied. There was no
> hinge other than the pivot that the keys normally have.
> -Dana
> 
> 
> > Yes ARP Soloist and Pro Sololist use CMOS foam under the hinged keyboard
> as
> > the pressure sensor. I forget what the Multimoog uses but I think it's
the
> > same approach. Not sure about the ARP Pro DGX because I don't have one,
> but
> > I'll bet it's CMOS foam too. Hey I was at an ARP demo, at ABC Music in
> > Burbank back when I was in high school. Boy was that neat. Helped to put
> me
> > on this nutty road I'm on for life. The first first first wake-up call I
> > ever got was at Springfield Music in Northridge, where my buddy and I
rode
> > our bikes to, and there was a Minikorg and a Synthacon in there. I'd
like
> to
> > find both of those someday but the ebay prices at the moment are just
too
> > steep.
> >
> > - Gene
> >
> 
> 
>