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To: <aitelm@ase.com>
From: "Dale R. Leavens  My other computer is a Cray." <dleavens@puc.net>
CC: <blinux-list@redhat.com>
Date: Sun, 20 Dec 1998 00:46:42 +0500
X-Mailer: Net-Tamer 1.11.2
Subject: Re: Shift state alarm.
List-Id: <blinux-list.redhat.com>

What about a small bit of logic which would only sound a tone when the LED
state changes, say a double tone (beep beep) when a led is switched on and a
single tone when off.  Each LED could have a different tone, low for shift,
medium for insert and high for numlock.  higher

On 1998-12-18 aitelm@ase.com said:
   >Luke
   >I am a bit more simple minded than that.  I am thinking of opening
   >the keyboard (usually 2 screws) and soldering wires to the "hot"
   >side of the three LEDs.
   >We will need three buffers to isolate us, so we do not disturb the
   >LED function -- they could be almost any ten cent transistors.  The
   >signals can then switch three oscillators whose outputs are mixed
   >to send the one, two, or three tone chord through another ten cent
   >transistor to almost any kind of speaker, like a pc speaker or a
   >tiny (tinny?) pietzo speaker.
   >The whole kluge could be assembled for less than a few dollars
   >worth of parts.  Most likely, the job will require a sighted
   >technician (hobbyist?), but I do
   >not want to underestimate anyone.
   >So far, the suggestion was/is an impulsive response to Will's wish
   >list, and
   >I have not actually designed and built it -- yet.   If you and
   >others would benefit from it, I would be willing to design it and
   >build up a proto (to make sure it really works) and make the design
   >available, under the GNU copyleft or equivalent.
   >Moe
   >----------------


Dale R. Leavens:  Cochrane Ontario
                  Home of the Polar Bear Express!

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