[sdiy] Substitute for pin matrixes? Neat solution?

[Tom Farrand]

Forget the Hall.  Reed switches on the PCB and move a cylindrical
magnet towards or away from the reed switch.  The matrix "pin" is a
plastic housing that can be grabbed and pushed or pulled to
engage/release the connection.  The magnet is housed inside the
plastic pin "plunger".  The nice part is that the reed switch does
everything passively ... electronics not needed.

I posted a much longer message about this but it never showed up on the list.

Peace.
Tom Farrand


On Sat, Jan 23, 2010 at 4:44 PM, karl dalen <dalenkarl at yahoo.se> wrote:
>
> Could be.
>
> At least a 3.6V Hall could flip a +/-5V HC4316 switch.
>
> Btw, Allegros A328x sot23/to92 operate from anything between 4,2 to 24V.
> It seams to work the same way as RHOM's but uses a pullup.
>
> KD
>
> --- Den sön 2010-01-24 skrev John Mahoney <jmahoney at gate.net>:
>
> > Från: John Mahoney <jmahoney at gate.net>
> > Ämne: Re: [sdiy] Substitute for pin matrixes? Neat solution?
> > Till: synth-diy at dropmix.xs4all.nl
> > Datum: söndag 24 januari 2010 01.00
> > At 03:19 PM 1/23/2010, karl dalen
> > wrote:
> > >Guess what i found?
> > >
> > >Bipolar hall switch!!!
> > ...
> >
> > Neat, but those operate at fairly low voltage. Not a
> > problem?
> >
> > John
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>
>
>      __________________________________________________________
> Låna pengar utan säkerhet. Jämför vilkor online hos Kelkoo.
> http://www.kelkoo.se/c-100390123-lan-utan-sakerhet.html?partnerId=96915014
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy