This part is a kind of semiconductor called UTC17821.

Function of this product has DUAL 5W BTL AUDIO POWER AMPLIFIER CIRCUIT.

Manufacturers : YOUWANG ELECTRONICS

Image and pinout :

Some of the text within the PDF file :

UTC17821 LINEAR INTEGRATED CIRCUIT DUAL 5W BTL AUDIO POWER AMPLIFIER CIRCUIT FEATURES • Vcc=11V,output=5W(8 ) • Built-in standby function • Built-in DC volume circuits APPLICATIONS • TVs, audio equipment, personal computers, active speakers SIP12H-2.54 BLOCK DIAGRAM 10 11 GND (Ch1 Output) Ch1 Output Ch1 Output YOUWANG ELECTRONICS CO.LTD 1 GND (ch2 Output) Ch2 Output 2008.02.17 V1.1 Ch2 Output standby Vcc Ch2 Input Ch1 Input Volume GND 12 1 2 3 4 6 7 8 5 9 UTC17821 PIN DESCRIPTION Pin No. 1 2 3 4 5 6 LINEAR INTEGRATED CIRCUIT Pin No. 7 8 9 10 11 12 Function Vcc Ch1 Output(+) GND(Output ch1) Ch1 Output(-) Standby Ch1 Input Function GND(Input) Ch2 Input DC Volume Ch2 Output(-) GND(Output ch2) Ch2 Output(+) [ ... ]

UTC17821 PDF Datasheet Download