●Double cassette tape recorder system preamplifier
●The BA3423S is a record /playback system preamplifier for radio cassette decks. With four control pins it allows switch ing between I/O for the A (play only) and B (record and play) mechanisms, input for tape, radio, and microphone, on and off switching for line out and recording output, and equalizer switching for normal and high-speed dubbing. It requires about half the number of external components of its predecessors which means simplified assembly and over all cost savings.
●Features
●1) Built-in switch for playback equalizer amplifier for the A and B mechanisms.
●2) Built-in normal /high-speed equalizer switch for the playback equalizer amplifier.
●3) The B mechanism input is also used as the recording output, so a switch is not required.
●4) Built-in tape /radio input switch, and microphone mixing.
●5) The microphone amplifier is used as the mixing amplifier, and the line can be muted to allow the built-in
●microphone to be used for recording.
●6) Built-in ALC circuit.
●7) Built-in recording equalizer circuit, and internal switching of the normal /high-speed equalizer is possible.
●8) All stages are directly connected, so coupling capacitors are not required.
●9) Muting is applied as required during switching to reduce switching noise (transition muting).
●10) Pin assignments has been designed to facilitate placement of attached components and PCB design.
●Applications
●Dual-cassette radio cassette players.
