[sdiy] Rotary Encoder Question

[Iain Duncan]

Paul, as a beginner I won't pretend to understand this completely, but does
the scheme you mentioned meann you will get a rotary encoder that does the
accelerating turn thing that the knob does on EMU modules? If I spin it
slowly I get small slow increments, and if give it a sharp filck it will
zoom all the way to 128.

Thanks,
Iain



----- Original Message -----
From: Paul Maddox <Paul.Maddox at wavesynth.com>
To: Dr Steve Grainger <s.grainger at staffs.ac.uk>
Cc: Synth DIY List <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, January 10, 2002 2:23 PM
Subject: Re: [sdiy] Rotary Encoder Question


> Steve,
>
> Long time no talk, hope you are well...
>
> > It's the type that has two outputs - one produces pulses (or
opens/closes
> > switch contacts) when rotated in one direction and the other output does
> > the same when the encoder is rotated in the opposite direction.
> >
> > Most incremental encoders I've found on the web seem only to produce
> > quadrature pulses which are not suitable for a MIDI controller I have
> > in mind.
>
> this is the case for most of these.
> however you can cheat ;-
>
> http://pages.zoom.co.uk/andyc/
>
> click on electronics and look at the top circuit..
>
> useing a D type flipflop...
> Tie one output of the Rotary encoder to D, one to Clk...
> Now use the one tied to clock as your RATE of turn, the Q output now gives
> you direction, either 0 or 1!
>
> Simple..
>
> Paul
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