Logic level test circuit

Published:2012/10/31 21:20:00 Author:Ecco | Keyword: Logic level test | From:SeekIC

CD40106 is the six inverter with Schmitt trigger (only two of them ), T is the probe, when the T in contact with a point of 0 , after inverting driver, LED - R emits red light, LED-G is extinguished; when the detection point is 1 , the LED- R is turned off because of reverse bias, and after twice inverting, LED - G emits green light; when T probe detects CP pulse, two diodes are lit alternately. When clock frequency is higher than 24Hz, since the visual pictures effect, two diodes look flashing at the same time, rather than alternately flashing, so they emit orange- red light.



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