What is this phenomenon ???

Miscellaneous
1

Hi dudes

I owned my 2nd Midistart2-Masterkeyboard and plugged it to my PC with normal Midiconnection (not USB)

Then I plugged a walltransformator with 9V/500mA, it works great…after a little time I plugged off the PSU and noticed, that the power LED is still on…

ok I thinked and grabbed the keys and it sends also NoteOns/Offs…I was more surprised when I switched Off the Power-Button and the keyboard works also  :o

Is this normal  ???  ???  ???

Regards

MTE

2

There are two possibilities on this:

  1. Your keyboard has some very big caps inside. How long can you play without power ?

I think, after a while the led is off, or not?

  1. Your keyboards soaks power from the midi +5V. This would not be so good. But it would be possible.

greets

Doc

3

My evolution MK-7 mini keyboard does the same, it plugs into the PC joystick/midi port. I think it uses the joystick power common on the soundblaster input plug.

As a thought, I’ve just worked up a design for a stand alone box for it - so it will work as a midi keyboard without being plugged into the PC. Is it worth putting on this on line ?

Mike

4

Is it worth putting on this on line ?

Yes please :slight_smile:

5

I suppose this from an usb device but standard midiplugs :? But its very curious that it works when your powerbutton is OFF.

6

As above, it’s probably working off the +5v line coming from the MIDI connection. The power button would be connected to the external inputs, so the MIDI power wouldn’t be affected by it.

7

The problem is…I have 2 identical Midistart2 Keyboards who only send at Midichannel 1 :frowning: (you cant change it)

on my 3rd Keyboard (Yamaha SY-35) i can change the Channel…

So my Idea was 1 midistart to usb (ch1), 1 to my Motu (ch1)…the yamaha to motu (ch2)

rest of the equipment also to the Motu with upcoming channels so i dont need any Midiyoke-driver for the other external machines…

8

The problem is…I have 2 identical Midistart2 Keyboards who only send at Midichannel 1 :frowning: (you cant change it)

Sounds like it’s time I started working on the MIDIbox Master Keys project…

9

MIDIbox Master Keys project

sounds interesting :slight_smile:

10

sounds interesting :slight_smile:

It might be good for you… I wrote a reply but it got a bit lengthy so I made the wiki page: MIDIBox Master Keys :slight_smile: Hope you like!

11

You know, stryd, if you added an emulated joystick port to the MBMK that would make a load of cheap keyboards (and four pots) useable.  Same goes for a USB Host IC …

This one’s nice, it has two high speed USB ports, software switchable to Host or Slave.  It even has PS2 ports.

12

That is a nice IC, but having taken a look at it, I think it might be beyond my skill to use it :-[ Maybe for version 2 :wink:

Although, a joystick port could be cool, I could make a simple circuit to switch it between joysticks and midi keyboards… Is that what you meant?