PHILCO CAIXA PHT3000 Soundbox– Circuit Diagram Schematic March 09, 2017 Used ICs: OB2273MP(SMPS control) – WEF4N40(Switching) – LM358 – WB8P76SOP14 – TPA3118D2(Audio Output Amp) – 24C02 – RDA5807M – PT2399 – MCU2228 – HT1621 Exploded Schematic Click on the schematics to zoom in google.com/+GopakumarGopalan Read more