Dear experts, I want to build a project for communication between STM32 and PC, but when adding USB project, I always don't know which one to add, which leads to the added file always being warned of
LED power supplies are increasingly adopting multi-channel output and multi-channel constant current solutions. I would like to ask how you all achieve this reasonably.It will increase the cost. Is th
May I ask, on which layer should the semicircular part in the figure be drawn? Since "KEEP OUT OF AREA" is written at the position of the semicircular part, is it necessary to draw a semicircular PCB?
In addition to the voltage difference, what are the differences between the voltage of the car OBD interface after starting and after the ignition is turned off? (Such as waveform, AC component...) Ca