Commonly used audio circuits for color TVs: TDA7057

TDA7057 pin functions and reference voltage:

Pin 1: 0~1V——DC volume control 1

Pin 2: 0V - empty

Pin 3: 2V——Input 1

Pin 4: 19V - power supply

Pin 5: 2V——Input 2

Pin 6: 0V——signal ground

Pin 7: 0~1V——DC volume control 2

Pin 8: 8.6V - forward output 2

Pin 9: 0V - amplifier ground 2

Pin 10: 8.6V - negative output 2

Pin 11: 8.6V - negative output 1

Pin 12: 0V - power amplifier ground 1

Pin 13: 8.6V - forward output 1