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Subject: Re: [korgpolyex] Re: Poly 800 data knob schematics

From: Michael Hawkins <korgpolyex800@...>
Date: 2014-05-14

Can someone provide a link to the encoder datasheet? We should put that into the folder where the schematic is. Hopefully, someone can pick up on it from there.

I have suddenly begun to really like the idea of a knob for data entry. I might even try and add a board into the HAWK kit bundle offering.

Mike

On Wednesday, May 14, 2014 5:01 AM, "Sami Jumppanen sami.jumppanen@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:
 
What is the scan frequency?

Anyway, what if the quick pulses were merged, so that it corresponds to steady button press? I took a look at the data entry schematics, and without detailed examination I assume things like this have already been considered.

I guess it requires pulse modifier to keep the pulses at constant length. And when pulsing fast enough, it never gets low. It's been a long time since I saw such, haven't been active on electronics lately.

Sami


On Tue, May 13, 2014 at 3:45 PM, bperkins211@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:
 
I authored that and probably should delete it.I abandoned the project when I couldn't get a good response from the P800.I believe the problem is that the MPU is not scanning fast enough, coupled with the problem of a wide enough pulsed signal from the encoder to keep the 4066 switch closed long enough.That's my best guess. And is probably why we have not seen a successful mod like this work.It's a mod that seems to require modification to the firmware to actually support a encoder for value changes to parameters to work decently.~Blaine



--
Sami Jumppanen
http://netti.nic.fi/some-e