Diodes in keyboard circuits, etc.

[Synthusiast]

Hi,

Thanks to all of you who responded to my question :)

Cheers,
Synthusiast

----- Original Message -----
From: "Hairy Harry" <paia2720 at hotmail.com>
To: <synthusiast1 at yahoo.com>; <synth-diy at node12b53.a2000.nl>
Sent: Monday, October 02, 2000 11:02 PM
Subject: Re: Diodes in keyboard circuits, etc.


> Hi All
>
> A simple answer is that the diodes isolate the keys from each other so
that
> pressing more than one key at a time does not produce an
> ambiguous output.  If you look at a schematic of a keyboard matrix
> (say 8 rows by 8 columns...) you will see that pressing more than one
> key at a time will cause short circuits in rows / columns.
>
> If that doesn't get it I'll try to draw an example later of exactly how
this
> happens, and how the diodes are an easy way to prevent this.
>
> H^) harry
>
>
> >From: "Synthusiast" <synthusiast1 at yahoo.com>
> >Reply-To: "Synthusiast" <synthusiast1 at yahoo.com>
> >To: "Synth DIY List" <synth-diy at node12b53.a2000.nl>
> >Subject: Diodes in keyboard circuits, etc.
> >Date: Mon, 2 Oct 2000 21:30:03 +0200
> >
> >I wonder where these diodes that you find in keyboard circuits and matrix
> >switch circuits are used for. Is it for debouncing or is it something
> >totally different?
> >
> >Tia,
> >Synthusiast



_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com