I’m using a DC-DC Step Down Buck Converter to try and power a photon. But I’ve found the converter suppiled power is introducing noise in one of the sensors being used in my project. Specifically it’s occurring with a sound sensor. If I power the Photon with the converter the background sound/noise value is 150 but if it’s powered by a battey (i.e. a clean power supply) the background sound/noise value significantly reduced to 50.
I understand that capacitors can be used in some way to help here. But am having trouble understanding the details of how to go about doing this. I’ve been reading capacitor examples trying to get some clarification but am kind of lost.
Would I be looking to create a decoupling capacitor? If so how would I know what value capacitors to use? The input power to the buck converter is from an AC to DC adapter and is 27 volts at 55ma.
Is this somehow helpful? LM2596 pdf specs. On page 11 is shows what looks like a table of capacitors for various voltages in and out.