If boards with a failed PCM1804 never fail when the part is replaced, that points to counterfeit parts.?
No, it doesn't; counterfeit parts is only one option; there could also be ESD problems causing it, either during assembly, or subsequent handling somewhere along the line; or there could be problems during our bootloader flashing and testing procedures.?
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And I'd not have them stuffed at that assembly house, make it?a hand add at QRP Labs instead.
Just when I thought I was already having the maximum amount of fun possible per day...