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 Ω — single power during recording)
• Cue-tone oscillator and current amplifier (15 Hz typ. sine wave)
• Governor circuit
• Microphone power supply
• LED drive