This logic circuit has one end ideal for measuring states in digital circuits, one need only connect the ground wire from the mass of the measuring circuit and click on where we are interested to know the state, if the red LED lights indicate a level oy if under green lights will be high. Describing the circuit observe as input the measured value serves to cut or saturation in the transistor Q1, depending on the value taken by the issuer that is the basis of the input buffers Ic1 investors (2 buffers to the logical state "1 "and 1 buffer for the logical state" 0 ") thereby fueling LED color with the corresponding state. (Green = "1", red = "0").
Vin: + 4.5 (3 x LR44)
Designed in Proteus v.7.4 SP3.
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