How do circuit boards make electronics do things?
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The circuit boards simply provide the mountings for electronic components and provide paths between said components – all the magic is in the components, which use varying number of electrical states to create the logic of the device.
For example, a bog standard switch ( Such as a light switch.) has two states, one where the circuit connects to power something on the other side or disconnected to not allow the circuit to complete.
We’ve reached the point where we can create components at the nano scale and can create rather complex logic.
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