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

[Steve Taylor]

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
>
> ---> 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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