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I have drawn up a schematic here: http://drive.google.com/uc?export=view&id=0B6ytVYfsfAiNanpLbmtBMC1pbDg The design would benefit from a few modifications since the current to the IR emitter is not very well controlled and the pulse width is very narrow. Changing RV1 to 1K and putting 390R in place ...

Is there a schematic available for this module? I can trace the circuit out but it would be quicker if a diagram was already available.

Thanks.