[sdiy] Calculator Synth

[Grant Richter]

John Simonton had a great design for a matrix scanning keyboard dating back
to the 4700 series. It was very simple to implement, only two CD4051s and a
counter (very vaguely remembered) and the design automatically made an
arpeggiator.

It was the alternative to the 4700 keyboard with the computer. It used a DAC
to make the output voltage. Does anyone have a copy they could scan? Or know
where one is on the net (http://www.paia.com maybe).

It really was very simple and extremely clever, like many of John's designs.

From: Prototek <prototek at optonline.net>
Reply-To: owner-synth-diy at dropmix.xs4all.nl
Date: Mon, 13 Aug 2001 20:39:36 -0400
To: Dr Strangelove <phdinfunk at hotmail.com>, synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Calculator Synth


   Great suggestions by Dr. Strangelove. I was just browsing through the
Digi-Key catalog I received today and spotted some really sweet looking
keypads. If you have catalog number "TO12," then go to pages 523 and 524.
Does anyone know if any of these would work? I guess the main question is,
how would I get those keys to trigger the sounds? I've never worked in the
realm of keypads and the like so I welcome any guidance/ideas.

                          keep computing,
                          proto
------
"By pressing down a special key it plays a little melody."
Kraftwerk, "Pocket Calculator"



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