[sdiy] CV to rotary encoder?

[elmacaco]

I would think you would want something that would not necessarily go through
the modes sequentially  (voltage control up  or down).  I am thinking of a
setup like X volt per position.

Say a voltage input range of 5 volts (or whatever) divided up by the number
of settings so you could do some bit swapping sequencing that jumps around
to the different levels.  Not sure how useful that would be, but you could
do the sequential up and down with a rising or falling voltage.


----- Original Message -----
From: "Grant Richter" <grichter at asapnet.net>
To: "Paul Perry" <pfperry at melbpc.org.au>; <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, April 29, 2003 2:08 PM
Subject: Re: [sdiy] CV to rotary encoder?


> OK, I am not absolutely certain about how current this information is,
this
> is off the top of my head. I had to build an encoder simulator to test
> theatrical rigging controllers which used incremental encoders.
>
> There are two types of encoders, absolute and incremental. An absolute
> encoder outputs direct binary relating to it's position.
>
> An incremental encoder uses two square wave signals with a 90 degree phase
> separation (quadrature). The direction of travel is indicated by which
phase
> leads the other. I seem to recall one is a reference phase and the other
can
> reverse direction just by inverting the signal.
>
> This requires a 4 state machine which can be built from a 555, 4024 and
> 4052. You just tie input pins to high or low to form the correct signals.
> For reference X out phase 1 (X0, X1 +)(X2, X3 gnd) Yout phase 2 (Y1, Y2
> +)(Y0, Y3 gnd) invert phase 2 to switch direction.
>
> Hope this helps.
>
> > From: Paul Perry <pfperry at melbpc.org.au>
> > Date: Tue, 29 Apr 2003 14:26:16 +1000
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: [sdiy] CV to rotary encoder?
> >
> > A lot of gear now has a rotary encoder..
> > there is probably an easy way to make a CV to rotary encoder
> > converter, so when the CV increases by yea much, the encoder
> > goes foward one unit and so on.
> > Or just keeps going up while CV is above a threshold, back
> > when below it.
> >
> > paul perry melbourne australia
> >
> >
>


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