DIY MIDI-Cable

Parts Questions
1

Hi

Yesterday my Midicable got broken…dunno why, it dosnt send or receive anything  >:( checked it with my multimeter, but only the ground pins make a beep…

so I build one myself like described here :

15-pin SUB-D          5-pin DIN

  (Pins in front-sight of the Plugs)

1                8                  2

o o o o o o o o                  o

o o o o o o o              5  o  o  4

9            15            3  o      o  1

MIDI-In Pins :       MIDI-Out Pins :

SUB-D    DIN          SUB-D    DIN

4    ->    2            8    ->    4     

8    ->    4            12  ->    5   

15  ->    5

Now I tested to upload some code with my self-soldered cable to my MB but it dosnt…MIOSStudio receives midisignals when I turn pots/encoders but the uploads dosnt run :frowning:

Now my Question :

Do I need make a optocoupled Cable like in the schematic here ?

Best Regards

MTE

2

Hmm you’ve got two conflicting sets of pinouts there bro…

3

Oooops…I fixed that typo  :-[

4

Here ya go, get it from the MMA schematic - straight from the horses mouth :wink:

http://www.midi.org/about-midi/electrical.shtml

5

Stinky Horses…clean them the teeth  ;D

After 1 hour removing fuggin hotglue with my rusty knife  ;D my broken cable is now opened…

Now Im thinking about to buy a new one (will be expensive 20.- and more :frowning: )

or making a little schematic, sprinting to my cellar for hunting the parts…maybe making a doku for the wiki too  :slight_smile:

6

Which Transistor should I use an how to solder it  ?

I didnt understand this schematic -> http://www.midi.org/images/midiadap.gif

7

I’m lost in this kinda thing but the “done thing” seems to be a 7404… Maybe these will help. Maybe they will totally balls the whole thing up  ;D

Joystick Adapter NOTES:

  1. A good choice for the Optoisolator 6N137. A 6N138 will work, but is slower.

  2. Resistors are 5%

  3. Inverter A can be an IC or a transistor.

  4. It is extremely important not to ground pin 2 of the MIDI IN connector. A noise-causing ground loop will result if you do. Pin 2 of the MIDI OUT connector should be grounded. That way the shield of the MIDI cable will be grounded on one end as desired.

http://www.kpsec.freeuk.com/trancirc.htm

http://www.troikaranch.org/schematic.html

http://www.tigoe.net/pcomp/midi.shtml

http://www.tigoe.net/pcomp/labs/lab-midi-other.shtml