I am trying to Optoisolate a signal from microcontroller. I am driving the signal to base of MMBT2369, and opto isolator LED is connected to Collector of the transistor.
When transistor is not in place, uC output is as per logic i.e toggles every 1 second. When Output from uC is connected to base of MMBT2369, uC stops toggling and output is always constant low.
What can be the reason for this behavior?
Circuit is as shown. SOL_ENB is signal from Microcontroller.