Experiment 13 - The AND Circuit
The AND logic combines two inputs.
For the AND logic the result of Q
can only be equal to 1
if the inputs A AND
B are equal to 1.
This you can also build using transistor 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.
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AND symbol in circuit diagrams.
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Transistor circuit of a AND logic unit.
(Enlarge)
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Circuit diagram of AND logic with a transistor.
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Replace the circuit by the shown transistor circuit...
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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).
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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.
