#LiChuangEDA Summer Training Camp#MAX98400-Class D Pocket Amplifier

Note: The instantaneous noise in the video is when the focus mode selection lever of the camera is turned (it makes a sound that my photography skills are not good)

1. Introduction to project functions
A small Class D amplifier, very small, only 80mm*50mm, but can output 22W@8Ω*2, which solves the problem that other amplifiers cannot be put into my pocket
2. Project attributes
The project is open to the public for the first time
3. The hardware part
is not a big problem, it is very simple, and I copied the datasheet directly, but there is a pitfall, the SHDN pin must be powered separately, don't connect it to VS, otherwise it won't make any sound at all
As for the auxiliary power supply, I have extra 7805 and 1117-3.3, and I also need to add an LED (actually I don't want to buy a voltage regulator), so I just made it casually. If it works normally, the official circuit below will do, and it's cheap. The
gain selection is shown in the figure.
Note: Because the panel has miscalculated the hole position of the 3.5 socket, don't proof it first! ! !
I'll update it as I like after school starts (what)