Page 779 - Mechatronics with Experiments

LABORATORY EXPERIMENTS 765

FIGURE 11.12: Picture of the experiment for a first-order active low pass filter: circuit on
breadboard and the oscilloscope.

Procedure

1. Design an active low pass filter as shown in Figures 11.11, 11.12, 11.13 with a
cutoff frequency of f ≈ 1.9 kHz and a DC gain of |G DC | = 1. Use R = 820 kΩ
1
c
and calculate R and C to meet the design specifications.
2
2. Build up the circuit and power the op-amp with a 9-V battery or a DC power supply.
3. Set up the function generator to produce a sinusoidal wave with an amplitude of
6 V (peak-to-peak). Adjust the offset voltage so that input excitation voltage range is
within the DC power supply voltage range.

GND
V–
IN
OUT

V+

FIGURE 11.13: Picture of the circuit of a first-order active low pass filter on the solderless
breadboard.