I have a circuit im breadboarding so I am transmitting a IR puslse to a open collector type reciever, being used to align two devices  If I connect the emitter to ground, then have a 150ohm pullup on the collector, I can see the voltage on the PIC input range from no IR signal of 5V, and down to about half a volt when i position the IR tx diode just right.

  So, question is, in order to increase the range can I simply burst pulse the LED with the max current (right now 30mA but it can accept up to 50mA) or change the pull up resistor to change the sensitivity?  Does my question make sense?  In other words, I see a range from 200 to 255 but I'd like to see the transistor turn on harder to pull it more to ground so which makes sense to do.

  JJ

		
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