Experiment 2 - The NOT-Transistor Logic (RTL)
The next logical operation is the NOT logic.
The corresponding logical circuit has only one input and one output.
The truth table shows you the NOT-logic.
The result at the output Q
negates the input
Truth table of the NOT logic.
NOT symbol in circuit diagrams.
Transistor circuit of an NOT logic.
Circuit diagram of the NOT logic with a transistor.
Use to the transistor circuit shown as the logic unit.
When the push-button switch S1 is open,
(A = 0),
the transistor blocks and a current flows through the resistor R2a
The LED lights up
(Q = 1).
When you close S1
(A = 1),
the transistor switches through and short-circuits
The LED goes out
(Q = 0).
This is the logical behavior of a NOT circuit.
In the next experiments you look at logic units with two inputs.