4.1. Assemble the low-pass filter circuit which is in Figure 3.1. Follow the instructions below step by step. a) Setup the signal generator so that it produces a sinusoidal waveform, with a peak to peak voltage of 10V. Use the oscilloscope to verify this. b) Use channel 1 of the oscilloscope to display Vin and Channel 2 to display Vout. You may need to set up the triggering function of scope, especially for the lower frequencies. c) Starting from 50 Hz, vary the frequency of the input signal up to 2500 Hz in a sufficient number of steps. For each increment, note down the peak to peak voltage of the output for each frequency, and table it to your laboratory report. Then, plot a graph of the amplitude of Vout against the frequency. d) From your graph, mark off 70.7% of your peak voltage, and note down the corresponding cutoff frequency, fc. e) The cut-off frequency can also be calculated by the circuit components R and C. Calculate and compare it with your experimental result.
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4.1. Assemble the low-pass filter circuit which is in Figure 3.1. Follow the instructions below step by step.
a) Setup the signal generator so that it produces a sinusoidal waveform, with a peak to peak voltage
of 10V. Use the oscilloscope to verify this.
b) Use channel 1 of the oscilloscope to display Vin and Channel 2 to display Vout. You may need
to set up the triggering function of scope, especially for the lower frequencies.
c) Starting from 50 Hz, vary the frequency of the input signal up to 2500 Hz in a sufficient number
of steps. For each increment, note down the peak to peak voltage of the output for each frequency, and table
it to your laboratory report. Then, plot a graph of the amplitude of Vout against the frequency.
d) From your graph, mark off 70.7% of your peak voltage, and note down the corresponding cutoff
frequency, fc.
e) The cut-off frequency can also be calculated by the circuit components R and C. Calculate and
compare it with your experimental result.
4.2. Assemble the high-pass filter circuit which is in Figure 3.1.
a) Repeat the tests as outlined in the previous section but this time start your frequency readings at
50 Hz and work your way up to 10 kHz. Record all your results in your report sheet.
b) On the graph that you draw, indicate the cut-off frequency.
c) Calculate the cutoff frequency.
d) Compare the calculated and the measured values of the cut-off frequency.
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