H9 modification for MIDI power
March 29, 2019 - 11:11 am
Some product, for example, those from MIDI Solutions, rely on power being supplied by the connected MIDI Output socket.
H9's before Serial 16329 did not supply this power, but a simple modification can be made to remedy this.
Instructions are attached (ignore first page) - soldering is required, but it should only take 5 minutes for a skilled person.
This only applies to H9 - 'Factors do not have this issue.
| Attachment | Size |
|---|---|
 102274.pdf | 373.64 KB |
I had no idea about this
I just assumed MiDi power was a no no
Thanks a lot for all this useful info!!
Would it be practical to send power out the unused pins of the MIDI ~INPUT~?
Cuz I could get behind self-powered MIDI controllers.
Alas, the H9 does not have enough spare power to do this. It would also be pretty non-standard.
Some products, including our Eclipse, send out power on pins 6 and 7 of a 7 pin DIN, but the H9 only has 5 pin DINs. Further, the voltage and polarity of this power is unspecified, and it would need a special cable.
You could hard-wire your H9 and make as special cable....
fine. Ill use standard wiring :(
wouldn't that be elegant though?
Also why do people need a 7-pin cable to include back-voltage... When a MIDI input only needs 3/5 leads?
WHO DESIGNED THIS STANDARD AND WHERE CAN I FIND THEM