Question 1
AIM: The aim of the experiment is to investigate the operational function of a logic circuit.
- Connect the circuit as shown in Figure 1.
- Ask the supervisor to check the circuit connection.
- You are given Table 1.
Table 1
S1 |
S2 |
VOUT (V) |
Logic State |
L |
L |
|
|
H |
L |
|
|
L |
H |
|
|
H |
H |
|
|
- Connect switches S1 and S2 to their low (L) positions and switch ON the power supply unit.
- Measure and record in Table 1, the output voltage (Vout).
- Repeat steps (d) and (e) for the other positions of switches S1 and S2 as shown in Table 1.
- Switch OFF the power supply unit.
- Complete Table 1 by writing logic state ‘0’ for Vout less than 1 V and logic state ‘1’ for Vout greater than 1 V.
- From your result, state the logic function performed by the circuit.
- Write the Boolean expression for the logic circuit.
- Draw the logic gate symbol for the circuit.
Observation
The expected responses were:
Table 1
S1 |
S2 |
Vout (V) |
Logic State |
L |
L |
0.1 - 0.9 |
0 |
H |
L |
0.1 - 0.9 |
0 |
L |
H |
0.1 - 0.9 |
0 |
H |
H |
8.0 - 9.9 |
1 |
(i) AND gate
(j) or
(k)
.