Line width current sealing equipment forget ruler

I summarized my experience in board drawing and made a PCB ruler.

The relationship between line width and current is written on it. The length of the ruler is 21*4. It is also very good to give away for actual use without the need for a schematic! I have already made samples for 5 yuan, which is equivalent to 3 yuan each. The quality is great (you can’t buy such a good ruler for 3 yuan outside). If you like Jialichuang’s plate making level, remember to give me a thumbs up, thank you! It takes time to collect and adapt. , please like and collect! ! ! Actual picture: Remember to choose black, it looks great

There is a small bug in the encapsulation part of the original work. Thanks to the friends in the comment area for pointing it out. The original work has been modified by the boss, so I will make the modifications here.

Note: The back packaging part of the PCB ruler refers to @ Mobyw  https://oshwhub.com/Mobyw/PCByuan-jian-feng-zhuang-chi