The CMOS logic probe circuit

Published:2011/7/18 6:35:00 Author:Christina | Keyword: CMOS, logic probe | From:SeekIC

This circuit is the fault diagnosis tool, you need to connect it to the microprocessor to display the state of important port. When the TTL input is 1 , the LED turns on; when the TTL input is 0 , the LED will not turn on. When the input is from 1 to 0 or 0 to 1 , the edge LED-2 turns on just one time. The input port uses the CMOS inverting buffer 3a to prevent the probe affects the work of microprocessor.



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