Active Bandpass filter using Op-amp in Hindi - YouTube
Design Low-Pass, High-Pass, and Band-Pass Filters in Browser in Minutes | via @adi_news « Adafruit Industries – Makers, hackers, artists, designers and engineers!
What is the operational amplifier circuit that can be used as an active low pass filter? - Quora
Active Low Pass Filter
Active Low Pass Filter: Design and Applications | Electrical4U