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Audio ICs

Dual preamplifier with ALC detector

circuit

BA3313L

The BA3313L is a dual preamplifier IC with built-in ALC detector circuit, designed for use in stereo radio cassette record-

ers. It comes in a compact 12-pin ZIP package, and has two record / playback preamplifiers, and an ALC detector circuit.

The preamplifiers can be directly coupled to the tape head without coupling capacitors to prevent tape head magnetiza-

tion and “pop” noise generation.

With the built-in ALC detector circuit, an ALC circuit with large dynamic range can be constructed with addition of just

an external time constant circuit.

FApplications

Stereo radio cassette recorders

FFeatures

1) Input bias circuit does not require coupling capaci-

tors.

2) Built-in ALC circuit with external time constant circuit.

3) Wide operating power supply voltage range.

4) High gain.

5) Low noise.

FBlock diagram