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

Adam Inglis 21pointy at tpg.com.au
Wed May 23 05:34:51 CEST 2012

On 23/05/2012, at 8:40 AM, Joe Grisso wrote:

> I considered strongly in combining this for the sequencer I'm building
> right now, but the big problem is that while 99% of DIN products only
> have clock and start/stop, there are a few out there that have tap,
> fill, continue, etc. on pins 4 and 5 (which are dedicated to MIDI).
> That seems a bit dangerous to me.

Those machines, such as the TB303, TR606, TR808, etc, when acting as  
receivers of DIN sync, probably wouldn't be affected by MIDI signals  
arriving at their "Tap" or "Fill" pins, would they?


> Best,
> -- 
> Joe Grisso
> Detachment 3, Ltd.
> On Tue, May 22, 2012 at 1:41 PM, Mattias Rickardsson  
> <mr at analogue.org> 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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