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f-alpha.net » Electronics » Basic Circuits » Transistor Logic » Let's go... » Experiment 4 - OR Logic (RTL)

Experiment 4 - The OR-Transistor Logic (RTL)

The truth table shows you the OR logic...

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

Truth table of the OR logic.

OR symbol in circuit diagrams.

Transistor circuit of an OR logic. (Enlarge)

Circuit diagram of the OR logic with transistors.

Use to the transistor circuit shown...

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

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