Audio Amplifier
SIP12
+------+
++ 12| OUT-A
| 11| BS-A
| 10| Vcc
| 9| BS-B
| 8| OUT-B
| 7| GND-OUT
| 6| GND-IN
| 5| IN-b
| 4| NFB-B
| 3| BYPASS
| 2| NFB-A
++ 1| IN-A
+------+
No frequency to check