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Square Wave Generator Using Op amp:
The Square Wave Generator Using Op amp means the astable multivibrator circuit using op-amp, which generates the square wave of required frequency. The Fig. 2.83 shows the square wave generator using op amp.
It looks like a comparator with hysteresis (schmitt trigger), except that the input voltage is replaced by a capacitor. The circuit has a time dependent elements such as resistance and capacitor to set the frequency of oscillation....

Second Order High Pass Butterworth Filter:
The second order high pass Butterworth filter produces a gain roll off at the rate of + 40 dB/decade in the stop band. This filter also can be realised by interchanging the positions of resistors and capacitors in a second order low pass Butterworth...

First Order High Pass Butterworth Filter:
As mentioned earlier, a high pass filter is a circuit that attenuates all the signals below a specified cut off frequency denoted as fL. Thus, a high pass filter performs the opposite function to that of low pass filter. Hence, the First Order High Pass...

Second Order Low Pass Butterworth Filter:
The practical response of Second Order Low Pass Butterworth Filter must be very close to an ideal one. In case of low pass filter, it is always desirable that the gain rolls off very fast after the cut off frequency, in the stop band. In case of first...