[sdiy] MIDI & DIN Sync in the same connector?

[Adam Inglis]

MIDI and DIN sync are combined in this set-up that can drive a  
modified TB303
http://www.firstpr.com.au/rwi/dfish/sync-lead/

Adam

On 23/05/2012, at 5:41 AM, Mattias Rickardsson wrote:

> MIDI and DIN sync (in its simplest form, with just clock and
> start/stop signal) use different pins in the same connector. The
> possibility of supporting both MIDI and DIN sync in the same
> connectors have crossed my mind often during the years, but I can't
> remember seeing any products using it - apart from Dutch
> Engineers at work, who seem to have combined MIDI and DIN sync connectors
> on a couple of their products:
>
> Their 1-to-4 "Midi Thru Box" can also be used as a DIN sync thru box
> (presumably just passively connected),
>  http://www.engineersatwork.nl/dtronics/pages/midi_sync_thru_box.html
> and their "Midi to Sync converter" seems to send DIN sync signals and
> MIDI timing signals simultaneously on the same connector (presumably
> driven by the same clock pulses, since MIDI timing messages are just
> positive pulses with the same frequency as DIN sync, IIRC).
>  http://www.engineersatwork.nl/dtronics/pages/midi_sync_converter_ms06.html
>
> Are any other products using combined connectors in similar ways?
>
> I don't see any electrical reason why DIN sync OUT wouldn't be
> suitable to incorporate in every MIDI OUT and MIDI THRU connector
> (provided that the correct DIN sync signals are generated internally
> of course). Are there any reasons not to do it?
>
> Combining MIDI IN and DIN sync IN is a bit trickier, especially since
> MIDI needs to be galvanically disconnected and since there might be
> exotic "tap", "fill in" or "reset and start" DIN sync data on the
> incoming MIDI pins, but it should be quite possible as well. :-)
>
> /mr
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