In quite a lot of PCBs that I have seen, they often have these small metal bars going across from one point to another.
Here is an image of what I am talking about. In this example it is a charger:
J2 and J3 are what I am talking about
For reference, here is the other side of the PCB:
So,
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What are these called?
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What is the point of these? Why not just use tracers in the board or a wire?
Best Answer
These are called "jumpers" or "jumper wires" and simply connect two parts of the PCB together. They are common for single-sided PCBs to make a connection that may not be routable. The alternative would be to have a double-sided PCB, but that would be more expensive.