PULSE_COMPARATOR_FOR_TAPE_READER

Published:2009/7/11 5:18:00 Author:May | From:SeekIC

With hole in front of photocell, negative pulse into comparator is much larger than positive drive pulse obtained from GaAs lamp circuit, and comparator delivers negative output pulse.With no hole and no negative pulse, comparator output is positive but same magnitude, because amplifier negative pulses are twice as large as positive input pulses.-R. F. Broom and C. Hilsum, Diode lamp Makes Tope Readers Faster, Electronics, 36:20, p44-45.



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