Lab report

Figure 1

Experiment 9

Comparator-Integrator circuit using 741C

Objective: To understand and comparator operation.

Components and instruments needed:

 Resistors: Two 10 kΩ, Two 22 kΩ, one 330 kΩ, one 1 kΩ,

 One 1 kΩ potentiometer

 Capacitors: two 1.0 µF, one 0.01 µF (10nF)

 Op-amp: two LM741C

 LEDs: Red and Green each

 DC power supply

 Function generator

 Oscilloscope (also 2 probes for both channels)

 Multimeter

Procedure:

1. The schematic for the Comparator-Integrator circuit is shown in the figure 2.

2. Construct the part-1 of the circuit in the figure 2 first.

3. By varying the 1 kΩ potentiometer, record the waveforms, using oscilloscope, at point A

when the red LED turns and ON and OFF.

4. Now complete constructing the remaining part of the circuit.

5. By varying the 1 kΩ potentiometer again, record the waveforms, at point A (comparator) and

point B (Integrator) (when the red LED turns and ON and OFF). You might have to use the

vertical adjustment to capture two waveforms on the same graph.

6. Clearly detail all your observations in the discussion section of your lab report.

Figure 2

Report:

Write a report that summarizes this experiment. Your report brief must include:

a) Cover sheet.

b) Objective - a short paragraph stating what the experiment is about.

c) Procedure - a description of the process of conducting the experiment. It should not be a

step-by-step account, but rather an overview of what was done.

d) Discussion - a complete discussion of the results of the experiment and the principals

involved. Include the outputs and also the screen captures as needed to support the

statements made in this section. Relegate extensive lists of raw data and detailed

computations to an appendix as appropriate.

e) Conclusion - a summary of what you have learned from the experiment.

f) Appendix - original raw data (initialed by the lab instructor) and details not placed in the

discussion section