midi in problem

Testing/Troubleshooting
1

Hey guys, my core stop working…

First question.

without Optocoupler, led (TEST IN3) still lit is normal???

thanks!

Edit:

I put a led direct into J13 whit anode in +, and catode in -.

ok. led flicks whith midi in.

but if i put it in pin 2 and 3 of optocoupler (anode in 2, cathode in 3).

led dont flicks.

Is Normal?

its my second optocoupler i’m very confused… :logik:

…

2

Hi,

without Optocoupler, led (TEST IN3) still lit is normal???

yes, because the LED will be supplied through the pull-up resistor R6

I put a led direct into J13 whit anode in +, and catode in -.

ok. led flicks whith midi in.

but if i put it in pin 2 and 3 of optocoupler (anode in 2, cathode in 3).

led dont flicks.

Is Normal?

yes, because the optocoupler consumes power.

Best Regards, Thorsten.