This part is a kind of semiconductor called SVI2004A.

Function of this product has Pinouts.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

SVI2004A Page 1 of 1 SVI2004A 1 Internal layout of SVI2004A 16 Pinouts for SVI2003 SVI2003A SVI2004A SVI2004C Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Function Ch 1 +Sine IN (audio signal +1.8v) Ch 1 +V (+50V/8 ohm +43V/4 ohm) Ch 1 Output (to spkr) Ch 1 -V (-50V/8 ohm -43V/4 ohm) Ch 1 -Sine IN (audio signal -1.8v) Ch 1 REF (connect to pin 3 via 560 ohm Resistor) Ch 1 Level Shift (overload det signal normal -30V) Ch 1 GND Ch 2 GND Ch 2 Level Shift (overload det signal normal -30V) Ch 2 Ref (connect to pin 14 via 560 ohm Resistor) Ch 2 -Sine IN (audio signal -1.8v) Ch 2 -V (-50V/8 ohm -43V/4 ohm) Ch 2 Output (to spkr) Ch 2 +V (+50V/8 ohm +43V/4 ohm) Ch 2 +Sine IN (audio signal +1.8v) Note: STK 2028 2038 2048 & 2058 (all except mkII types of the listed) are pin compatible as [ ... ]

SVI2004A PDF Datasheet Download