Overview

The LA4167M is a record/playback system IC supporting microcassette and compact cassette recorders. This is a high-performance IC that has on-chip a governor circuit for motor control, a voice sensor circuit that detects sounds and switches the motor on and off, and a cue-tone circuit for instantly finding the desired segment to play back.

Features

? Can switch between recording and playback with a single mechanical switch.

? Pause switch can switch the governor on and off.

? Cue-tone switch can record specified oscillator output (sine wave) during recording.

? The governor can automatically be switched on or off according to the mike input level during recording, and the on/off level for the governor can be varied continuously by the external volume control (used to adjust volume during playback).

? Mike monitor level is continuously variable.

? LED pin for turning off the LED only when cue-tone is on.

Functions

? Microphone and playback preamps

? Record amplifier

? Power amplifier (BTL 4 ? — single power during recording)

? Cue-tone oscillator and current amplifier (15 Hz typ. sine wave)

? Governor circuit

? Microphone power supply

? LED drive