The Circuit Boards
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Circuit boards

 The Radio Circuit

The Radio Reflection

The Billy cart Blueprint

 

Circuit boards are usually use in almost all eletronic machines that are found. You can't see the circuit board because, you have to screw the screws out and open this eletronic machine to see the circuit board in the machine. Here are some examples.

A computer has a motherboard.

A digital clock has it's own type of circuit bard.

And so on.