There are two versions with 3 and 4 expansion ports, and the shell shape is the same.
The panel is fixed with M2*9mm knurled copper pillars and M2*3 flat head screws . Tighten firmly to install the shell perfectly.
And in order to reduce frequent contact with soldering, all devices are single-sided SMD packaging. Pay attention to device packaging and don’t buy the wrong one.
The circuit principle is basically consistent with the data sheet circuit.
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