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f-alpha.net » Electronics » Basic Circuits » Transistor Logic » Let's go... » Experiment 3 - AND Logic (RTL)

Experiment 3 - The AND-Transistor Logic (RTL)

The truth table shows you the AND logic...

A B Q
0 0 0
0 1 0
1 0 0
1 1 1

Truth table of the AND logic.

AND symbol in circuit diagrams.

Transistor circuit of an AND logic. (Enlarge)

Circuit diagram of the AND logic with transistors.

Use to the transistor circuit shown as the logic unit...

  • If one or both push-button switches S1 and S2 is open, the corresponding transistor blocks. Due to the resistor R3a there is 0 Volt at the output (Q = 0).
  • If the push-button switches S1 AND S2 are closed, both transistors switch through and a voltage applies to the output (Q = 1).

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