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Mike, I am making an IR tracking system to track a free falling object. So my IR compound eye is my radar/sonar. I"m want to modulate the IR so the receiver can discriminate from the ambient IR in the room. I figured that pulsing a BD 140 will increase my IR light intensity hence increasing the IR transmit range. I guess I am a little confused on the difference between pulsing and modulating. I know what modulating is and its role in Comm, but am I doing both by only pulsing the BD 140? I'm not transmitting any data. What the receiver receives will be fed into a differential op amp which will go to a DC motor and "track" and moving object based on the amt of IR light received...