题目内容
PCB layout are derived from the circuit diagram, the components and connections are placed and routed by the designer to get the best result. When the PCB layout is complete, the final CAD file is sent to a PCB manufacturer.
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After the printed circuit board ( PCB ) is completed, electronic components must be attached to form a functional printed circuit.
Prototype circuit boards are generally assembled by an electronics engineer rather than an assembly line worker or technician.
Building an actual circuit to verify that the theoretical design works. Prototype microprocessor circuits are generally debugged with specially written diagnostic code.
Production ：Following the pilot run there will likely be changes to the software, and possibly the circuit design, as the unit develops into a stable, final product.
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