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The Arduino floating-point formatter gags on some values
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Even 1 ppm = 125 Hz chunks seem awkwardly large
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After resoldering all the joints, it continued to not work
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We’ve never seen one with those feather patterns and colors;
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The solution was to rename the files after copying them
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The pins are correctly labeled
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So a cheap AD8310 Log Amp module from eBay can work in the LF band
