I am working on a project to actuate some moderate amperage relays (30VDC 10A). I can select relays that have either 5V or 12V coils. I am going to be using a PIC24 which has output of 3.3V (on most pins).
My question is should I include a optocoupler to seperate the MCU output voltage from the voltage to control the relay coil?
Also, I have been looking at some setups which would actuate the relay coil based on a Active Low input. Is there an advantage to using Active Low versus Active High?
My question is should I include a optocoupler to seperate the MCU output voltage from the voltage to control the relay coil?
Also, I have been looking at some setups which would actuate the relay coil based on a Active Low input. Is there an advantage to using Active Low versus Active High?