 The following schematic appears. This is to increase Sampling frequency
by using interpolator. (version 1.2 or higher is needed)  Left click on TXTIN (U_1) to select it and right click to choose "Open
a Monitor". Then you will see a wave form on the monitor window. This wave's sampling
frequency is 1kHz. We will make this in good shape by Over Sampling.  Open a monitor for FFTMON(U_3) to see the spectrum.  You may see a frequency, that is 400Hz sampled by 1kHz. 
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