Hi there! In the circuit attached, I am curious about OK5 (the optocoupler on the right side). Is it ok to leave the collector like that, with no resistor limiting it? Should I set it up differently, with the pin attached to the collector and a pull-up resistor, grounding it when the LED is on? This is in a high noise environment, so I would like to clean up as much as possible. P.s. Do you see any other issues that should be addressed in the circuit?