https://devzone.nordicsemi.com/f/nordic-q-a/17135/unstable-vddHi everyone, I have a nrf52-DK, I made samples with the saadc unit and i noticed there are unexplained peaks. I connected the MIC&#39;s output (its VDD is from the board) to an oscilloscope and saw the peaks occurs when the vdd(provided from a usb cableen-USTelligent Community 13Wed, 19 Oct 2016 17:27:33 GMThttps://devzone.nordicsemi.com/thread/65761?ContentTypeID=1Wed, 19 Oct 2016 17:27:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cfe305ee-e3aa-49f8-9e95-954b12fbac05etamar<p>The capacitor didn&#39;t change it : I will stay with the battery for now, if you will have any solution i&#39;ll be happy to hear :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/65760?ContentTypeID=1Wed, 19 Oct 2016 10:33:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cb23749f-9c54-4d32-ab85-f162c25d898f&#216;yvind Karlsen<p>Ah, my bad. I saw this as the kit not working when powered by battery, but working when connected to USB. USB noise is quite common, you can try to smooth it out with a large capacitor (µF or so) at the 5V terminal or use a &quot;usb decrapifier&quot; on the USB line.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/65759?ContentTypeID=1Wed, 19 Oct 2016 09:55:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e13a3ea7-17e9-4418-9ffe-38b7952d84ceetamar<p>It is possible, only that with the coin cell it works perfectly, and from a USB it doesn&#39;t stabilize. To solve this for now, and to still have a uart connection with the computer I plugged in 2xAA batteries and shorted their negative side with the board&#39;s ground, it works good but still..</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/65758?ContentTypeID=1Wed, 19 Oct 2016 09:00:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:262ada0b-d038-4037-84d7-850850103fc8&#216;yvind Karlsen<p>How much current does the microphone draw? Possibly it could be too high for the coincell battery to be able to operate.</p><div style="clear:both;"></div>