[sdiy] Possible MIDI interface powered by MIDI driving device...

[Jean-Pierre Desrochers]

Here is a possible MIDI interface that would sink its power from a MIDI 
driving device...

http://www.arcenson.com/public/MIDI_interface_power_steeler.JPG

---> Assuming that the driving MIDI device
---> (keyboard, sequencer, pedal board, etc..)
---> is powered by internal +5VDC supply..
The CPU would have to sink its 5vdc thru the 220 resistor
of the driving device. Doable..
I also think that it could work since the CPU MIDI output
would be 'opticaly' linked with the final receiving MIDI device.
Both driving and receiving devices would avoid ground loops
while a CPU process is running between them..

A friend of mine asked for a simple 'MIDI active sensing code (FE)'
hardware filter working without a DC supply..

JP