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preenfm2 and preenfm3 / Re: New Build Issues
« on: October 04, 2016, 10:48:25 PM »I think the difference between the USB and the DC in is only because of the difference of voltage they provide.
USB is often a bit less than 4.8V.
On top of that USB often adds noise that reach the audio path...
Before trying the shield, make sure you solder a 22 ohm resistor in the "oled" resistor slot on the PCB.
XAvier