problems about optocoupler

[neha Joshi]

Hello!
Im doing a small project in electronics.In which im using an optocoupler.It is MCT2\MCT2e(photo transistor,base driven).I have a problem about its connections.It is base driven optocoupler.The pin 6 is the base of the photo transistor.so where should I connect it.I have understood the connections of all other pins.Personally i feel it shouldnt be connected,but left open.
please will anyone one help me with it.
And i have a deadline for submitting this project by this weekend.so please help me people.

 

[Leftyretro]

Hello!
Im doing a small project in electronics.In which im using an optocoupler.It is MCT2\MCT2e(photo transistor,base driven).I have a problem about its connections.It is base driven optocoupler.The pin 6 is the base of the photo transistor.so where should I connect it.I have understood the connections of all other pins.Personally i feel it shouldnt be connected,but left open.
please will anyone one help me with it.
And i have a deadline for submitting this project by this weekend.so please help me people.

It depends on how you are using the coupler. For simple digital on/off application you can leave the base connection floating. If however you wish to pass analog information, then the base connection allows one to bias the photo-transistor to a linear operation.

Lefty