Design of Electronically Controllable Multifunction Active Filter with Amplitude Controllability Using Two Commercially Available ICs. - Narumol Onanong; Piya Supavarasuwat; Daungkamol Angamnuaysiri; Surapong Siripongdee; Amornchai Chaichana; Winai Jaikla; Peerawut Suwanjan (J. Electr. Comput. Eng., 2022)