[sdiy] Diode Matrix Keyboard Circuits?

[klosmon]

One of the simplest I've seen is the old Paia diode encoded keyboard -- 
details were in "Friendly Stories about Computers & Synthesizers" by John 
Simonton.

~G
At 09:51 AM 12/7/2006, you wrote:
>Hello Harald,
>
>Thank you for the reference.  I took a look at that web page, but I had a
>hard time understanding it, even using an online translation program
>(Babelfish).  From what I could understand, it seems to me as though they
>are working with MIDI.  I am looking for a way to bypass MIDI altogether and
>go right from a matrix-keyboard to CV/Gate/Trigger output.  If I am
>mistaken, please let me know.  I have a 16F877A which could give analog
>outputs via PWM but I have yet to learn how to program it ;-)
>
>thanks sincerely,
>
>Dave
>
>
>----- Original Message -----
>From: <HA.Synth at t-online.de>
>To: "DSL FODA01" <foda01 at epix.net>; "Synth DIY"
><synth-diy at dropmix.xs4all.nl>
>Sent: Thursday, December 07, 2006 10:44 AM
>Subject: Re: [sdiy] Diode Matrix Keyboard Circuits?
>
>
> > Hi Dave,
> >
> > look at this: http://www.heise.de/ct/Redaktion/cm/klangcomputer/
> > Sorry its German, but they sell the PCBs you need and you can download the
> > firmware there.
> >
> > Harald
> >
> >
> > Am Donnerstag, 7. Dezember 2006 04:56 schrieb DSL FODA01:
> > > Hi all,
> > >
> > > Does anyone here know of a good way to create a scanner circuit for a
>diode
> > > matrix keyboard?  I have a 49 key Yamaha keyboard here that already has
>a
> > > diode matrix type of board on it and I would like to use it to generate
> > > CV/Trig/Gate outputs.  I think a PIC or something like that would be
>best
> > > but unfortunately I don't yet have a high enough skill at low-level
> > > programming.  I have seen some designs in hardware, but the only board I
> > > saw (Ray Wilson's) is discontinued.  Any other suggestions?
> > >
> > > Dave
> >