IR transistor??

[sonaiko]

hey guyss!!

i had the IR LED, and i needed a reciever for the IR light.
so i was given the IR transistor!!!
but i dont know how to use it!!!
i wanted to use it in a circuit such that when the IR LED goes on, the LED goes on, and when it is off, the LED is off...
i can do the circuit using LDR and a normal transistor...

can anybody help me?
i just want to know how to deal with the IR transistors... thanx..

 

[goodpickles]

If you understand transisters it is very similiar, the difference being the the gate is contolled via IR light rather than having an additional leg on the transister for voltage.

 

[sonaiko]

If you understand transisters it is very similiar, the difference being the the gate is contolled via IR light rather than having an additional leg on the transister for voltage.

i know that!
but should i add a resistance to the base???
wer should my normal LED be so that when the IR LED lights this LED lights?
on the collecter? i still need biasing voltage right?

 

[Screech]

yeap, on the collector.
the I.R led should be right next to the Transistor.
Cover them or daylight will turn on the transitor.

 

[sonaiko]

yeap, on the collector.
the I.R led should be right next to the Transistor.
Cover them or daylight will turn on the transitor.

man i dont know but i think this way the LED will always be ON anyway!!!
even if i took IR LED out of the circuit and made the left part be open circuit!
i only want the LED to be ON when the IR LED is on... thanx anyway..