[sdiy] replacing step incrementor/decrementor with continuous pot

[Synthusiast]

I used a Motorola MC14490 Hex Contact Debouncer in combination with a Bourns
Encoder for my MIDI-CV converter project. The IC is quite expensive (approx.
$7), though it works like a charm. Here's a link to the datasheet in
Farnell's website: http://www.farnell.com/datasheets/11242.pdf

One of these days I'm gonna build one into my Alesis Midiverb 4 ;-)

Cheers,
Martijn

----- Original Message -----
From: "Happy Harry" <paia2720 at hotmail.com>
To: <chris at scp.de>; <synth-diy at node12b53.a2000.nl>
Sent: Tuesday, March 20, 2001 9:57 PM
Subject: Re: [sdiy] replacing step incrementor/decrementor with continuous
pot


> If that is true, a retriggerable one shot will kill any pulses
> faster than you want to allow.
>
> I think most scanning software can run pretty fast, you need less than
> 5mS to eliminate key bounce.
>
> H^) harry
>
>
> >From: Christian Hofmann <chris at scp.de>
> >To: synth-diy at node12b53.a2000.nl
> >Subject: Re: [sdiy] replacing step incrementor/decrementor with
continuous
> >pot
> >Date: Tue, 20 Mar 2001 18:51:10 +0100
> >
> >
> >On Tue, 20 Mar 2001 17:07:51 +0000
> >Emmanuel AMADIO <emmanuel at postimpressions.co.uk> wrote:
> >
> > > Shouldn't be to hard using a rotary encoder with a bit of logic to
> >recreate
> > > the up and down from the increment/decrement
> > > or whatever of the rotary encoder.
> > > Basically the rotary encoder has 3 digital output which varies in gray
> >code I
> > > think, so you can determine if you
> > > increment or decrement or don't change using probably only logic
gates.
> >
> >Hi,
> >basically this may be possible - but it might not work as expected,
> >because the key panel scanning software's debouncing method may be
> >confused by pulses arriving faster than a normal human operator can
> >generate.
> >Debouncing is kind of a logical low pass filter, and it probably is
> >designed to reject fast bouncing spikes, but pass through repeated
> >button depressions.
> >Hard to say what will be the maximum rate for the encoder generated
> >pulses that will be accepted.
> >
> >regards
> >Christian
>
>