What is this phenomenon ???

[MTE]

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

[doc]

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?

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

greets

Doc

[TheAncientOne]

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

[stryd_one]

Is it worth putting on this on line ?

Yes please :)

[dj3nk]

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

[Jaicen]

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.

[MTE]

The problem is....I have 2 identical Midistart2 Keyboards who only send at Midichannel 1 :( (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...

[stryd_one]

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

Sounds like it's time I started working on the MIDIbox Master Keys project...

[MTE]

MIDIbox Master Keys project

sounds interesting :)

[stryd_one]

sounds interesting :)

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 :) Hope you like!

[DrBunsen]

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.

[stryd_one]

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 ;)

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?