Can anyone please suggest me a plausible solution for this:

a circuit is to be designed where two series connected LEDs are to be controlled by a 2N9303 transistor with a 12V supply and V break downn = 5V. The diode current is to be approx. 15 mA.

 

Have you sketched out your schematic yet?

 

What do you mean by the break down voltage?

This is serious: what color are the LED's?

The schematic would be very useful.

 

What do you mean by the break down voltage?

This is serious: what color are the LED's?

The schematic would be very useful.

I think he meant voltage drop. Or at least that is what I expect.

Circuit diagram needed.

 

folks! thats what the question is about. we are supposed to design the circuit

 

well....sketch out your schematic ... and show what you have done to accomplish the task. Then you'll have a specific question which can be answered.

Have you reviewed the rules for posting? http://forum.allaboutcircuits.com/showthread.php?t=3002

 

2N9303??? Is this a typo?

 

2N3903 does sound more likely.