No idea what needs to be pre scaled, but after power supply, it's the next section to be put together. Parts here were much closer together so there were a couple of times I got goofed up on the back, but with a little scratching I think I'm ok.
I need to write the company to see if there's a nonoscilliscope way to test this section


Or, you can get an Oscilliscope. Just tell yourself that you'll probably need it for future projects anyway.
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