cv to midi???

Christian Hofmann chris at
Mon Nov 8 11:48:18 CET 1999

On Mon, 8 Nov 1999 09:41:53 -0000 
"Fraser, Colin J" <Colin.Fraser at> wrote:

> Standard midi outputs have a ground connection (the shield), an open
> collector data output and a +5v output (the current loop).
> The data and +5v outputs should have a current limiting resistor or a couple
> of hundred ohms.
> Assuming you don't draw too much current, you can use the +5v and ground
> lines for a power supply.
> I guess the Korgs must use too high a value of resistor in the +5v output.
> It's easier to steal power form the midi line nowadays, as small
> microcontrollers use tiny amounts of current.
> It's so much nicer that having a wallwart.

it may be a clever way to keep things cheap.

But IMHO it's never _nice_ to use data lines for supplying power
if they're not spec'd for that ;-)


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