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Subject: Re: [korgpolyex] Re: rotary data dial +/-

From: Ullrich Peter <peter.ullrich@...>
Date: 2012-04-10

Hi!

 

Regarding my email from yesterday. I didn’t have a look at the datasheet of the ELM402. I thought that

it is the datasheet of the encoder itself and not a converter chip.

 

The chip is nice (quite similar to my solution) but the output pulse width can only be selected between

0.2 or 2ms.

I would say that 2ms will be the better value for synths as the scan rate is normally in the range of 100 to 2000Hz.

So I think it might fit for 80% of the synths.  You could get problems if the scan rate is slow because the

short pulses could be missed. Some older synth scan quite slow…

 

If you only want the chips then I could offer you my chips as well. Prices would be the same as the

EML402 (8.50$ DIL / 10$ SMD) but compare to these chips you can adjust the pulse/pause time via
the encoder – more flexibility that should match for every synth.

So it is cheaper than the complete datadial module but then you have to integrate the chip on a PCB…

 

For the SMD sockets I would need a lead time as I would have to buy a SMD test socket for chip

programming and would have to build a programming adapter.

 

Ciao
Peter

 

http://www.ullrich.at.tt

http://go.to/datadial (synth addon)

 

From: bimmerfan222 <bperkins211@...>
To: korgpolyex@yahoogroups.com
Sent: Monday, April 9, 2012 10:26 PM
Subject: [korgpolyex] Re: rotary data dial +/-

 

 


Hi Gordon, thanks for the reply.

Surely there is a way to slip in a rotary encoder to mimic a up\down value keys..

I was thinking of using this decoder by elmelectronics.com

http://elmelectronics.com/DSheets/ELM402DS.pdf

couldnt the outputs be placed in parallel with the value switches?

It can be set to generate 2.0msec pulses on two channels

--- In korgpolyex@yahoogroups.com, Gordon JC Pearc e <gordon@...> wrote:
>
> On 08/04/12 16:09, bimmerfan222 wrote:
>
> > I've yet to see an 800 with this simple, yet very helpful mod and am a little dumbfounded that it has not yet been done.
> > Debouncing is key to getting a smooth signal out to the triggers, otherwise you'd end up getting wild jumps in up/down values when moving the knob slow or fast.
>
> No, you won't.
>
> You'll get a rotary encoder that has to be turned painfully slowly to
> avoid it missing steps. The buttons are already debounced, and have
> quite a long debounce time.
>
> --
> Gordonjcp MM0YEQ
>

 




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