+-----------+ | STK413-430 | +-----------+ | Pin 1: Vcc | | Pin 2: R1 | | Pin 3: IN1 | | Pin 4: R2 | | Pin 5: IN2 | | Pin 6: R3 | | Pin 7: R4 | | Pin 9: OUT1 | | Pin 10: FB1 | | Pin 11: OUT2 | | Pin 12: FB2 | +-----------+ | | v +-----------+ | Speaker | +-----------+