I'm trying to connect this audio ic to the prop to drive an 8 ohm, .25 watt speaker. Im using a 5 volt external power supply. How do i connect to the pins on the ic? I will initially be using the gain 20. Would pin 6 be the 5 volt +, and pin 3 be from the prop? Should i have a resistor in series from the i/o pin since the voltage will be higher than 3.3 to the ic? Is Pin 2 ground from the prop? Pin 4, 5 volt ground? Looks like the gain 200 picture posted instead of the 20 gain.