AW: [sdiy] 3.3V and MIDI

[Ullrich Peter]

	>I've just received my development kit for Cygnal's microcontrollers.
	>Of course I'd like to add a MIDI interface to it. Unfortunately the
	>development board is all 3.3V, no 5V available. Before I add a
regulator,
	>I was wondering whether I can just get away with using 3.3V for
	>the midi interface? or does it really have to be 5V to comply with
	>the standard?
	

	As the MIDI interface is a current interface (nominal 5mA) it should be 
	no problem as long as the current can be sinked on the MIDI outport. But
you will have to adjust the resistor (normally 220 ohms) values so that the
current of 5mA can flow.
	Remember that the receiver also has a 220 ohm resistor on teh input.

	Ciao
	Peter
	
	Http://ullrich.at.tt