[sdiy] Calculator Synth

[Torbjörn Hörnfeldt]

Check out 

http://omega.tellus.vallentuna.se/anders/pdf/baspedal.pdf

for a bass pedal design using the 74c922.

Torbjörn

----- Original Message ----- 
From: "Ullrich Peter" <Ullrich at kapsch.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, August 14, 2001 1:59 PM
Subject: AW: [sdiy] Calculator Synth


> >A 74c923 keyboard decoder chip can look after the scanning of a 4x5
> array of
> >switches, and outputs a binary value. Couple it to a DAC, and you are
> done.
> >It even supplies a "trigger" signal when a key is pressed. I think
> someone
> >used this as a basis for a set of foor pedals ala Taurus too.
> 
> Yes, this circuit is very nice! And also the smaller part 74C922 for
> only 16 keys in a
> 4x4 matrix. I used the 74C923 in some computer circuits and they works
> really fine!
> 
> I have a datasheet in PDF format if anyone needs it (130kB).
> 
> Ciao
> Peter
> 
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>                    Ing. Peter Ullrich         mailto:ullrich at kapsch.net
>                    Homepage: www.ullrich.at.tt , http://come.to/ullrich
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>    .oooO           Hardware & Software Developer /  Electronic Musician
>    (   )   Oooo.   KAPSCH AG / ECCN Control Systems    Vienna / Austria
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