Silly electronics question for people… I'm building a circuit that needs to drive a LED dot matrix panel, which means I need a beefy 5V DC-DC power supply to step down from 12V. I found a suitable candidate: the Meanwell NID100-5. 5V 11A output. I'll be using it next to radio equipment, so class-B filtering is _very_ desirable. The NID100 can be used without filtering for class-A (industrial) applications, but for class-B you need filters. Below is the recommended circuit. I'm a little stumped with the inductor. This is not a symbol I'm familiar with. It is taken from the datasheet: https://configurable.meanwell.com/webapp/product/search.aspx?prod=NID100 - https://www.reddit.com/r/ElectricalEngineering/comments/a853u2/what_does_this_inductor_symbol_mean/ suggests it's a "differential mode inductor" - https://www.eevblog.com/forum/projects/meanwell-nid100-dcdc-module-inductor-selection/ calls it a common-mode choke The literature I can find says a differential mode inductor has two terminals, this appears to be a four-terminal device with two coils, mutually coupled somehow. Right now I have a Kicad schematic with a Wurth Electric 7448421016 subbed in there: https://www.we-online.com/components/products/datasheet/7448421016.pdf Is this the right type of filter here? Should maybe the connections on FL1 be swapped around to invert the phase? (e.g. swap pins 2 & 3, or 1 & 4) #Electronics #MeanwellNID100