"Roy J. Tellason" wrote to "Jasen Betts" (02 Feb 03  04:06:16)
 --- on the topic of "Monitors"

 JB> MIDI is also balanced,

 RJT> No it's not.  Typical driver circuit is one resistor to +5 and another
 RJT> tied to the output of an open-collector TTL gate.

MIDI is 5mA current loop, logic 0 is current ON.


 JB> but AFAIK most midi line driver circuits arent up to driving the
 JB> signals long distances.

 RJT> Yeah,  a couple of 220 ohm resistors at the driving end and one more
 RJT> at the receiving end don't give much margin when run off a +5
 RJT> supply...

MIDI spec is 50 ft max but 100 ft is not unusual.

 Mike
 ****

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