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The CMOS logic probe circuit

2015-01-03 19:41  
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The CMOS logic probe circuit
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.