The BA3870 is a bass boost audio IC for radio cassette players. BBS adjusts the base boost to a level appropriate for the volume, achieving a rich sound without distortion. Frequency characteristics can be set externally, enabling system design to meet the needs of the application.
   
Features
1) Adjustment of the base boost to a level appropriate
    for the volume through BBS.
2) Maximum bass boost level can be set externally.
    (20dB recommended)
3) Treble boost circuit (constant at 4dB)
    included on-chip to preserve overall balance.
4) BBS on/off “pop” sound almost nonexistent.
   
Applications
    Radio cassette players