Logic level test circuit diagram

Published:2011/5/3 0:49:00 Author:Ecco | Keyword: logic level, test | From:SeekIC

Logic level test circuit is shown as the chart. CD40106 is six inverter with a Schmitt trigger, T is the probe, when the T contacting point is 0 , after driven by inverting, LED-R emits red light, LED-G is off; when the detection point is 1 , LED-R reverse bias is off, but after being twice reversed, LED-G emits green light; when the T detects CP pulse, the two tube is lit alternately. As the clock pulse frequency is higher, while it is higher than 24Hz, the two tubes seem like being lit simultaneously because of the visual pictures effect of eyes, rather than flash alternately, the light is orange.



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