[sdiy] Aftertouch via Pressure

[harrybissell]

Of course the modern black foam is not a problem anymore afaik.  I agree about the
old stuff. Scraping with an x-acto knife will usually remove the corrosion...

H^) harry

James Patchell wrote:

>          And just make a big mess....I had some parts in black foam in
> plastic drawers...for almost 20 years...when I went to use the parts again,
> instead of foam, there was black power...(bad choice of words...if you are
> a Musket fan :-)....what a mess...the stuff stuck to the leads....and it
> got everywhere...every time I find parts in black foam, I remove them and
> put them in tubes.
>
>          -Jim
>
> At 09:24 AM 7/11/2003 +1000, Ken Stone wrote:
> >That CMOS foam was all the rage for presure sensors at one time.
> >Unfortunately, it seems to have a limited life. Any I have here with chips
> >in it has gone bad. It perrishes, and even worse, becomes corrosive.
> >
> >Ken
> >
> > >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
> > >
> > >
> > >-----Original Message-----
> > >From: harrybissell [mailto:harrybissell at prodigy.net]
> > >Sent: Thursday, July 10, 2003 1:16 PM
> > >To: Glen
> > >Cc: jhaible at debitel.net; The Peasant; synthdiy at sdiy.org;
> > >xyzzy at sysabend.org
> > >Subject: Re: [sdiy] Aftertouch via Pressure
> > >
> > >
> > >If you are willing to hinge the entire keyboard.... then optical, and
> > >resistive
> > >methods
> > >are easy as well.
> > >
> > >iirc (but it has been a long, long time) the ARP ProSoloist had aftertouch
> > >from
> > >a mechanically
> > >pivoting keyboard...  otoh that one I saw was the FIRST time I saw any
> > >synthesizer in the flesh... along with the Odyssey and 2600 models.  (high
> > >school demonstration)
> > >
> > >H^) harry
> > >
> > >
> >_______________________________________________________________________
> >Ken Stone   sasami at hotkey.net.au
> >Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> >Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>