Simple MIDI opto and setup

[yoho]

Hi all,

I've been busy building the last (?) simplesizer of the batch And things are working out ok (only a couple of minor problems so far). In a couple of building hours I think I'm ready to setup my simple.

Thomas kindly offered me a Simple MIDI pcb at the time of buying. Built it as well, but I'm having a bit of a problem. Actually two...

1. I tried to use a different opto for the MIDI input (a CNY17-II) but I'm not sure if the board is working. Could be because of the different opto OR because I don't know how it works.
Can anybody tell me what to expect when I push the button and what to do next?

2. Can (problably the same "anybody") confirm that I have to adjust one resistor (3k3 I think) to say 1k for the CNY to work?

Thanks in advance!

Erik

 

[tulle]

Welcher optokoppler ist normalerweise drin? PC900? Vergleiche das Pinning in den Datenblättern, ich meine da war ein Unterschied. Generell ist ein CNY17-2 ausreichend für MIDI.

 

[yoho]

normally 6N136 should be installed, but because the shop was closed (they do at night) I installed a CNY17. Difference is that 6N136 has a darlington-transistor and a separate opto-diode instead of a light dependant transistor like the CNY.

In the meantime I found a
french page from a guy who has tested a couple of them. I'll try replacing the resistor and report my observations, ok?

 

[yoho]

Proudly reporting

Replacing the resistor t 1k did the job. Now it's responing to MIDI.

Moving to problem 2: setup...

 

[comboy]

the button is for setting the lowest note if i remember right.
push it, then play the lowest note on your midi keyboard.

 

[yoho]

Thank you for this missing link

I'll go on and try to setup this baby. 2 pots can't be much.

And after that I can setup my simplesizer....