Answer :
One can isolate or filter out specific frequencies that fall inside a given band or range of frequencies using a passive band pass filter.
One can isolate or filter out specific frequencies that fall inside a given band or range of frequencies using a passive band pass filter. With just one resistor connected in series with a non-polarized capacitor, the cut-off frequency or "c point" of a straightforward RC passive filter can be precisely controlled, and as we have seen, depending on which way around they are connected, either a Low Pass or a High Pass filter is produced.
These passive filters can be used in straightforward ways in audio amplifier circuits or applications like loudspeaker crossover filters or pre-amplifier tone adjustments. Occasionally, it's required to only transmit frequencies within a specific range that don't start at 0 Hz (DC).
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