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One of the things that I enjoy doing is taking a small one or two sided circuit board and creating a schematic of it. Today I have a circuit board from a 105 db piezo siren for which I am going to create a schematic.  Here is the Module.              The first step is to get some paper and choose a starting point. In this case I picked the output transformer and then worked my way back. As you can imagine the board must be flipped back and for ...