The circuit diagram of the STK413-430 is relatively simple and straightforward. Here's a basic schematic:
Before connecting speakers, always measure the DC voltage at the output pins. It should be less than 50mV. If you see high voltage (near VCC levels), there is a short in the IC or a missing ground reference in your circuit.
In this post, we’ll break down the internal architecture, provide the standard application circuit diagram, and discuss what you need to know before wiring one up.
Resistor-capacitor (Zobel) networks are typically added at the output pins to prevent high-frequency oscillations and protect speakers. Protection Circuits: