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If you are making a really simple PCB then you might be tempted to just put all the traces on the "Top" layer of the PCB, however think really hard before you do this. The pads of the component you are going to use will be replicated on both sides of the board (assuming you take into consideration Dealing with Copper Clads dealing with a copper clad --- BUT the traces only connect to 1 of the pads -- specifically the pad on the layer that the traces were drawn on.
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[Some Pictures and Examples]
Dealing with a Copper
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Clad
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Unlike a PCB order from a normal [PCB house] PCBs on the PCB Mill are made by isolating the desired trace from the plate of copper (known as the "copper clad"). This can cause problems because according to your design there is only a thin trace of copper between any 2 points amongst a sea of essentially nothing (more specifically nothing conductive that would get in the way). With the isolation method that the PCB Mill uses, you have to make sure that your layout program of choice knows that there is copper everywhere else. Otherwise components will
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