https://devzone.nordicsemi.com/f/nordic-q-a/78324/issues-with-on-board-pdm-micI know there are other (long!) threads about PDM mics and I&#39;ve studied them all carefully. Unfortunately I&#39;m still having an issue with our on-board mic. The difference is that if I hook up an external PDM mic ( https://www.adafruit.com/product/3492 en-USTelligent Community 13Mon, 09 Aug 2021 13:33:25 GMThttps://devzone.nordicsemi.com/thread/324034?ContentTypeID=1Mon, 09 Aug 2021 13:33:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:64876c36-123b-4aa8-ab0d-183aaa019afbJared<p>Oh, that is probably it...&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/324033?ContentTypeID=1Mon, 09 Aug 2021 13:32:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:52c3481e-3029-4028-9376-bf267eaede0eJared<p>Hi there,</p> <p>Could you share a trace that shows:</p> <ul> <li>VDD</li> <li>L/R select</li> <li>CLK</li> <li>DATA</li> </ul> <p>I&#39;m wondering if there is any significant noise on L/R select and VDD. Also, are you using any pull on L/R select line?</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/324020?ContentTypeID=1Mon, 09 Aug 2021 12:58:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:91f8f6df-9bbe-4cfe-b3f5-f91452a55369Jeffrey Haynes<p>We are increasingly becoming convinced that this is a hardware issue, possibly because the assembly house incorrectly washed the parts, destroying the mic.</p><div style="clear:both;"></div>