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 Wall-mounted UV Air Sterilizer Uv Sterilizers,Hospital Uv Air Sterilizer,Wall Mounted Uv Air Sterilizer,Wall Mounted Uv Air Sterilizer Dongguan V1 Environmental Technology Co., Ltd. , https://www.v1airpurifier.com
