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 Forum index » DIY Hardware and Software
Midi to CV inside midi keyboards
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isak



Joined: Dec 13, 2009
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PostPosted: Sun Jul 28, 2013 3:46 am    Post subject: Midi to CV inside midi keyboards Reply with quote  Mark this post and the followings unread

Hi guys.

I have this idea of connecting the next midi to cv inside my midi keyboards and get the power from the USB of the midi keyboards.
http://www.acxsynth.com/midi2cvlite/midi2cvlitefr.htm

Will I get troubles powering the midi keyboards and the midi to cv using the USB as my power source for both?

Cheers,
Isak.

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JovianPyx



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PostPosted: Sun Jul 28, 2013 10:13 am    Post subject: Reply with quote  Mark this post and the followings unread

USB supplies power at 5 volts and 500 mA. If the two together draws more than 500 mA, there will be problems. So you need to know two things: Current needed by the keyboard and the current needed by the MIDI to CV. Add that together. If more than 500 mA, problems are likely.
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isak



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PostPosted: Sun Jul 28, 2013 12:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for replying.
Naturally, deferent midi keyboards takes deferent currents.
I have few midi keyboards.
The funny thing is my most smallest midi keyboard I have takes the highr current.
It's 500mA.
I guess no midi to cv in my small keyboards.

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bubzy



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PostPosted: Mon Jul 29, 2013 2:05 am    Post subject: Reply with quote  Mark this post and the followings unread

and, of course, unless whatever you are controlling with the voltage runs off +5v CV in then you are going to have to build a separate scaler.
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isak



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PostPosted: Mon Jul 29, 2013 2:14 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks Smile
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