This part is a kind of semiconductor called UTC7312.

Function of this product has Dual Recording / Playback Pre-Amplifier Circuit.

Manufacturers : Hangzhou Silan Microelectronics

Image and pinout :

Some of the text within the PDF file :

UTC7312 S w w aDUAL RECORDING/PLAYBACK D CIRCUIT WITH . PRE-AMPLIFIER w ALC DESCRIPTION The UTC7312 is a monolithic integrated circuit designed for dual pre-amplifier circuit with ALC for record /playback amplifier of cassette tape recorder. ta e e h U 4 t m o .c LI NEAR I NTEGRATED CI RCUI T FEATURES *High open loop gain *Incorporates ALC detector circuit *No input coupling condenser *Low noise and current consumption *Wide ALC range *Wide operating voltage range: Vcc=5V ~ 12V Low Power ON shock noise BLOCK DIAGRAM Rippli filter ALC input Ch 2 Vcc 14 Ripple Filter Phase compensat ion of ch1 ALC Time constant NFof CH1 ALC input Ch 1 Output 1 Input of Ch1 w w w t a .D 13 ALC 2 12 S a 11 4 e h Phase compensat ion of ch2 U 4 t e NFof CH2 .c m o DIP-14 Output 2 10 [ ... ]

UTC7312 PDF Datasheet Download