Jamil, what is the transmitter pulse rate and what kind of modulation?
Is it a TV/VCR/etc remote?

   - Tom

At 09:11 AM 7/2/99 -0700, Jamil J. Weatherbee wrote:
>It is an IR phototransistor not a photodiode, so I didn't think I would
>need amplification, just a pull up resistor.  But the output at the
>collector then doesn't seem like it will work very well with a ST input
>because it takes a long time for the output to rise back to 5 volts after
>it is exposed to IR.  I have it setup as a 10k resistor connected to +5V
>and to to IR phototransistor collector, with the emitter connected to
>ground.  I've put the Vcollector on the oscilliscope, and have been able
>to see signals from a IR transmitter by triggering on a negative going
>edge.