Audio Amplifier
SIP13
+------+
++ 12| FB AMP2 IN
| 12| AMP2 IN
| 11| ST BY
| 10| Vcc
| 9| AMP2 PUT
| 8| C2
| 7| GND
| 6| C1
| 5| AMP1 OUT
| 4| NC
| 3| Vref
| 2| AMP1 IN
++ 1| FB AMP1 IN
+------+
No frequency to check