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Created March 09, 2012
Last modified March 11, 2012
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Added Signal Inverter to photo detector circuit.
1) When SW1 is open and detector is aligned, timing circuit produces a spike when beam is interrupted. When SW1 is closed and detector aligned, timing circuit produces a gap when beam is interrupted.
2) D3 LED displays resulting timing signal.
3) BR1 allows timing circuit to be plugged in in either direction.


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