Loudspeaker amplifier circuit Reference application to: VDD = 4. 5V R4 = 220K C4 = 330P The circuit is useful to BFR03B chip, here is its detailed information: BFR03B specification Hvac Filters,Hepa Air Filter,Hvac Air Filters,Hepa Media Filter Dongguan V1 Environmental Technology Co., Ltd. , https://www.v1airpurifier.com
