555 tri-state acousto-optic logic pen circuit

Published:2011/8/4 8:57:00 Author:nelly | Keyword: tri-state, acousto-optic, logic pen | From:SeekIC

In fact, the 555's control site 5 foot and threshold site 6 foot are the input terminal of the voltage comparator I. If the 6 foot voltage is 5mv larger than the 5 foot's, the 555 will relability trig. Adding the DC voltage to the +/- shown on the figure 7-11. If the voltage is high, the LED1 lights. but if the voltage is low, the LED2 lights. Changing the rangeand RP1. When the two LED lights in turns, the measured voltage equals to multiply the range by the RP1. The measuring range has four planetary: 0-1v,0-10v,0-100v,0-1000v.



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