[sdiy] midi and DIN sync in the one connector

[Adam Inglis]

Thanks Brian
That's right, only MIDI in is required.
I do have a couple of units that use the extra functions of DIN sync,  
but if I wire a breakout cable as you've suggested, say with dedicated  
line mount sockets for midi and DIN, that should avoid problems there.
cheers
Adam
On 29/04/2015, at 4:30 PM, rsdio at audiobanshee.com wrote:

>
> On Apr 28, 2015, at 9:53 PM, Adam Inglis <21pointy at tpg.com.au> wrote:
>> I'm retrofitting my old Roland CR-8000 drum machine with a midi-to- 
>> trigger board.
>> To minimise cosmetic disfiguration, I thought I might make the DIN  
>> sync jack do double duty for midi.
>> That way I could run a simple preset pattern and spice it up with  
>> some extra notes/fills here and there.
>> Does anyone know if there is likely to be any problems doing this,  
>> say, caused by stray capacitance or crosstalk? The ground wire  
>> would have to be shared.
>
> MIDI does not use ground. MIDI is a current loop. The ground  
> connection is only for the shield, and it is only supposed to be  
> connected on the MIDI OUT, not the MIDI IN.
>
> If you're adding MIDI-to-trigger, then I assume you only have a MIDI  
> IN jack, in which case there is no ground connection anyway.
>
> There shouldn't be much crosstalk with the MIDI current loop. Maybe  
> your best bet is a cable that has isolated pairs inside, and then  
> you can dedicate one pair to MIDI, and another pair to Clock and  
> GND. The Start-Stop signal can be on it's own or just connect GND a  
> second time if there are three pairs in the cable.
>
> I assume you're not using the optional DIN Sync Reset-Start or Fill- 
> In signals - those would conflict with the MIDI pinout.
>
> Brian Willoughby
> Sound Consulting
>