Experiment 4 - The OR-Transistor Logic (RTL)
The OR logic logically combines 2 inputs.
The result Q is equal to 1,
if the inputs A
OR B, OR both equal to 1.
This you can also build with a transistor circuit.
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.
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OR symbol in circuit diagrams.
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Transistor circuit of an OR logic.
(Enlarge)
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Circuit diagram of the OR logic with transistors.
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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).
