I found a nice part to building a guitar amplifier. It's a all in one class D audio amplifier module, the size is only 0.6" x 1" x 0.15" (the size of a stamp). But the output power is 10Wx2, really amazing! No heat sink and external components (except power bypass cap) needed. I bet it's the simplest audio amplifier circuit you can find. Due to it's high efficiency there's no much heat generated even when the speaker is very loudy. It's ideal for battery powered applications.

Sound quality? pretty nice comparing to it's size and cost.

the part:


the board I made with VMA2016


reference circuit provide by v-module