hi antino before you move towards band pass first consider the low pass and high pass filter , low pass filter conncetion is possible to implement with the help of passive component such as resistor capacitor and inductor, usign rc circuit low pass and high pass filter deisgn is possible , if once you use this circuit combination as filter consider capacitor or inductor act as reactance and operation should be cosnidered as freq, so frequency and reactance is inversely proportional . if freq rises reactance low and vice versa . band pass is comination of high pass filter connected with low pass filter . if you know low and high pass filter thoroughly band pass and stop is easier