[sdiy] Reed Switch and Magnet Keyboard

[harrybissell]

(if I could find them I'd use) Tiny horseshoe magnets, with the reed switch
located across the gap.  As the magnet approaches the switch, the flux will
be concentrated through the switch vanes and tend NOT to leak to the
adjacent switches.  Might be harder to install

H^) harry

Tim Parkhurst wrote:

> You might get a little extra 'breathing room' between the adjacent
> magnets/switches by offsetting every other magnet and switch assy. In other
> words, on one key the magnet and switch sits fairly close to the pivot
> point; on the next key, the magnet and switch sit fairly far away from the
> pivot point. One problem I see with this approach is that the switches
> sitting close to the pivot point will tend to close slightly earlier than
> the switches sitting further away. This might be such a minor timing
> difference as to be unnoticeable, but (if needed) you might be able to
> compensate by putting shims under the switches that sit further from the
> pivot. This would raise them up slightly so that they would close earlier.
>
> Tim Servo
> "Imagination is more important than knowledge." - Albert Einstein
>
> > -----Original Message-----
> > From: Ray Wilson [mailto:raywilson at comcast.net]
> > Sent: Wednesday, December 10, 2003 5:11 AM
> > To: Scott Stites
> > Cc: Synth-Diy
> > Subject: [sdiy] Reed Switch and Magnet Keyboard
> >
> > Hi Scott (and list)
> >
> > You mentioned that you had made a keyboard using reed switches and
> magnets.
> > I want to outfit a set of piano keys in this manner and am interested to
> > know how you kept adjacent key switches from being activated together. I
> > have a source for some nice inexpensive reed switches and magnets of
> various
> > sizes and would appreciate your suggestions (and anyone elses who wants to
> > chime in).
> >
> > Thanks
>
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