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The logic probe circuit with display function

2016-12-06 12:01  
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The logic probe circuit with display function
The logic probe circuit with display functionThe circuit is shown in the circuit, it consists of a 6-backward phaser integrated circuit CD4069 and LED digit displayer. The NANDs of 1,2 and 3 form a Schmidt trigger as the logic probe, which is used to measure the logic LEV directly. The Schmidt trigger circuit is fixed with two threshold LEV, by adjusting R, we can change the LEV values of the two thresholds, so that we can judge the logic LEV of the circuit under test. The NANDs of 3,4 and 5 form a decoding circuit of strokes.