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

[Jean-Pierre Desrochers]

> You have created a ground loop by grounding the input socket.
> Only MIDI output sockets should be grounded.

The only devices that are grounded together are
the driving one and the processor device.
The final MIDI device that receives MIDI out is isolated
from the first driving device's ground as MIDI ask for.

JP


Le 2016-03-24 14:37, Steve Taylor a écrit :

> You have created a ground loop by grounding the input socket. Only MIDI 
> output sockets should be grounded.
> Also, assuming +5V is getting less reliable, all my MIDI designs have 
> been using 3.3V for a while now as allowed by the spec updates.
> 
> Steve.
> 
> On Thu, 24 Mar 2016 18:13:21 -0000, Jean-Pierre Desrochers 
> <jpdesroc at oricom.ca> wrote:
> 
>> 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 [1] 
>> ---> 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 
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> 
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Links:
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[1] http://www.arcenson.com/public/MIDI_interface_power_steeler.JPG
[2] http://dropmix.xs4all.nl/mailman/listinfo/synth-diy