A pass-band filter is a system keep only a certain frequency group and reject the other.
This system is composed of three parts:
- a signal generator to make a signal composed of different frequency and different waveforms
- the pass-band filter
- a signal processing part to make a "clean" square signal
The first operational amplifier is used to increase signal voltage. The second is used to make the square signal
The output signal is a square signal with a frequency of 10kHz
