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f-alpha.net » Electronics » Basic Circuits » Transistor Logic » Let's go... » Experiment 2 - NOT Logic (RTL)

Experiment 2 - The NOT-Transistor Logic (RTL)

The truth table shows you the NOT-logic. The result at the output Q negates the input A...

A Q
0 1
1 0

Truth table of the NOT logic.

NOT symbol in circuit diagrams.

Transistor circuit of an NOT logic. (Enlarge)

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 and Q. The LED lights up (Q = 1).
  • When you close S1 (A = 1), the transistor switches through and short-circuits Q. 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.

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