hai alll

Here I want asking few question, could phototransistor work with AC source at collector and emitter terminal??? If possible what max voltage I could put over there, because i tried to find max voltage that phototransistor could support from a datasheet but not included.

Thanks........

 

As long as the gate was supplied with a constant DC, It may work..

 

is it collector have voltage limit???

 

Ahh, wait a minute....

Are you trying to say you want to use a phototransistor with mains AC power?

What exactly are you trying to do?

 

Ive got to start thinking early in the morning before I start responding..

I was thinking in terms of low voltage a.c. I couldnt imagine them wanting to put 120vAC or 240vAC through a phototransistor. But I should have asked first.

Are you wanting to try to use a phototransistor as a photo driven relay?

 

yup. i want use as driven relay with nice response

 

No, you can't use a phototransistor with mains power.

You need to use low voltage DC with a phototransistor.

 

hummm...

thanks info me.......
do you know the suitable distance to separate LDR and LED to make them have good or maybe very good response....

thanks reading

 

I think you may be trying to recreate the workings of a Solid-state relay. Have a look at SSR.

 

hummm actualy not.....

im trying to control thyristor gate using digital method....... so i need analog optocoupler to control the firing angle. actually, thyristor gate depend on what???? current or voltage?????