[sdiy] push button CV wanted

[Ray Wilson]

Hi Roy

Use an up down counter (ala CD40193 or 2 of them for more bits) and add some
debounced push buttons (ala CD40106) to clock it up with one button and down
with another. Then put the output of the counter into an R/2R network with a
high impedance follower and some scaling to get the voltage to step in the
increments you want. .08333 V steps will be half steps for a 1V/Oct unit but
you could make the steps as you like.

Ray

----- Original Message ----- 
From: "Roy J. Tellason" <rtellason at blazenet.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, May 19, 2004 11:26 AM
Subject: [sdiy] push button CV wanted


> I have an application in mind for which I'd like the user interface to be
a
> couple of push buttons,  one that would raise and the other one of which
> would lower a control voltage.  Ideally,  some sort of interlocking would
> make it do nothing if both buttons were pressed at the same time.  Any of
you
> folks know of a circuit that'll do this?  Or have any ideas as to how it
> might be implemented?
>
>
>
>
>