9201FK MIDI Fader details
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Author:  PAiA-Scott [ Wed Apr 15, 2009 12:20 pm ]
Post subject:  9201FK MIDI Fader details

It is not far off from the calculation... It is about 1.4 seconds for the fastest rate that activity on all channels can be sent from one board. In this test, I used triangle waves to all eight inputs and viewed the MIDI output, increasing the rate until the MIDI messages nearly joined--beyond this point there would be lost information. For a square wave input, the time is about 40Hz. So on/off conditions can be handled much faster. The 40Hz rate works out to 25mS.

For only a 9201 board, it is important to connect all inputs or noise can be converted and transmitting as low cc values, taking time from the desired voltage inputs. Maybe this was happening for the user that was reporting sluggishness???? But, also, there is an amount of time involved with the processing of the information by the receiving device and this could have come into play too.

Thank you.

Sincerely, Scott Lee

Scott Lee wrote:
> I forgot your question about the programming. It is on EPROM firmware, a 2764. This cannot be changed remotely, but with a pc running an editor-assembler and EPROM programmer.
> Thanks again. --Scott
> Scott Lee wrote:
>> Hello Jose.
>> I will do some checking on this for you, but it will be tomorrow before I can get to it. Using a 330uS time for a MIDI byte, and three bytes for Control-Change- Status/Channel, Controller Number, and Value, ten cv inputs changing from 0v to 5v could generate 10 * 128 * 3 * 330uS or about 1.3 seconds for transmission of the MIDI messages. There would be some processing time added but this would all occur much faster than the MIDI transmission.
>> I have run a sequencer into the MIDI Fader at a fast rate and it followed it without any noticeable delay. There would be other factors too, but I will see if I can get some worst case voltage to MIDI message rates to you.
>> Thank you.
>> Sincerely, Scott Lee
>> dual flip wrote:
>>> Hi Scott and thanks for your reply, the only thing im worried about that i forgot to ask on my previous e-mail is this, some people told me that this converters are good but they are a bit sluggish, meaning that they have a lot of latency and they dont respond fast enough to the fader movements, so do you have any idea on how much latency is in this converters, the way im planning to use it is in the single channel mode, meaning each CV is routed to its individual output and each one transmitting the same CC, in my case volume i think will work fine. So in total i will be using 2 midi ports for a total of 32 channels, i dont know if latency is reduced in this way, since they will have their own channel. Perhaps I may buy one unit to make some tests before commiting on all 4 of them.
>>> Also something i wanted to ask you, is it possible to reprogram the CMOS onboard the unit in case i need to mod some of the operating functions of it?
>>> Best Regards
>>> Jose Ma. Gomez
>>> > Date: Mon, 13 Apr 2009 10:53:06 -0500
>>> > From:
>>> > To:
>>> > Subject: Re: 9201FK MIDI Fader Kit
>>> >
>>> > Hello Jose.
>>> >
>>> > Yes, the 9201FK MIDI Fader kit is a pcb project kit which converts 0-5v
>>> > dc from potentiometers or faders into MIDI Control Change messages.
>>> > Four of the kits can be used to get 32 continuous controller messages
>>> > by, for example, selecting the Multi-channel mode and sending cc10 on
>>> > channels 1-8, cc11 on channels 1-8, cc12 on channels 1-8 and cc33 on
>>> > channels 1-8, or some other group of four continuous controller numbers
>>> > on eight of the 16 channels.
>>> >
>>> > I have attached a pdf with details about the 9201FK.
>>> >
>>> > You might be interested in connecting the 9212K board with the 9201FK.
>>> > It can serve as the power supply and potentiometers and be mounted
>>> > directly above as it has the same mounting hole pattern. The controls
>>> > for adjusting drum sensor trigger amplitudes can also be used to vary a
>>> > 5v dc from 0-5v for the 9201FK.
>>> >
>>> >
>>> >
>>> > Sorry, but we have priced these items as low as we can, but for ordering
>>> > many kits like this, you would be saving shipping and handling amounts
>>> > that would be added for each kit. I have also attached information
>>> > about seeing the shipping amount.
>>> >
>>> > Thank you.
>>> >
>>> > Sincerely, Scott Lee
>>> >
>>> > dual flip wrote:
>>> > > *Hello, im very interested in the ****9201FK MIDI Fader Kit as i
>>> > > understand it converts analog signals into midi, the application im
>>> > > looking for is this: I have an old MCI jh500 mixing console, the
>>> > > automation is totally useless, so my idea is this, since the
>>> > > automation is VCA based, im thinking on buying 4 of this cards (to
>>> > > automate 32 channels) my idea is that this product of yours will
>>> > > convert control voltage into MIDI data so it can be recorded in the
>>> > > computer, but i need to know if the fader kit creates CONTINUOUS MIDI
>>> > > DATA or only triggers?
>>> > > Can you give me a special price if i order 4 of this?, do you ship
>>> > > over to Mexico City Zip 53100?, if so what are the shipping costs?
>>> > >
>>> > > Best Regards
>>> > >
>>> > > Jose Ma. Gomez
9201FaderNotes.pdf [47.68 KiB]
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