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[PCB] My question is about Share&Sell.

Good afternoon. I can't complete the Share&Sell.I uploaded a photo, added categories and description, allowed uploading Gerber files.And I click on "Start Sharing", but I don't go to the next page.The website gives the message: Creative Fields (select up to 3) Alphabetical.I press "Done" but nothing happens.What am I...
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[PCB] How to realize Micro Control System detect 220V AC signal?

I try to input 220V AC Optocoupler, but the output signal doesn't change. Is somenone know the error?
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[PCB] Arduino uploader code failed?

The program was successfully compiled but failed to upload. At first I choose COM1, but later after I change to COM3 still failed. Nothing happens when connected to the computer.The yellow light of the board will flash, the green light will be always on, the computer has installed the ide and driver. Why failed to upload code?
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[PCB] What a PCB Is Made Of

A basic PCB starts with a copper-clad fiberglass material or thin copper sheets adhered to either side of the board, as shown in Figure 1-5.Figure 1-5. Core material.With a multilayer_ board (a board with more than two copper layers), a piece of Pre-Preg (Figure 1-6) may be placed between these cores to create one solid board with several cop...
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