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f-alpha.net » Electronics » Semiconductor Devices » Transistor » Go on... » Experiment 13 - AND Circuit

Experiment 13 - The AND Circuit

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 a AND logic unit. (Enlarge)

Circuit diagram of AND logic with a transistor.

Replace the circuit by the shown transistor circuit...

  • If one or both key switches are open, the corresponding transistor are shut. Through the resistor R3a the output is on 0 Volt (Q = 0).
  • If you press down the pushbutton switch S1 AND the pushbutton switch S2, both transistors switch through and at the output is set to 9 Volt (Q = 1).

This is the logical behavior of a AND logic unit.

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