Hi PI staff and forum. I am curious about some more ways to reduce EMI. My AC-DC supply powers another switcher with a DC rail (and a negative bias rail). I noticed that even when the rest of the unit is off, the EMI from the AC-DC is picked up on the other side of the enclosure (the output is separate from the output of the AC-DC supply). When I put in another supply like that of a small laptop brick (which conveniently fits in same spot) I do not see any EMI picked up on the connector of the unit. This is even evident in how much less is picked up by the scope probe 2 inch away. Examining this brick shows several folded layers of shielding tied to the low DC side of the bridge rectifier output. But even removing the shielding the EMI is much much less. And this is a much higher power supply (even though running unloaded). I noticed the transformer is toroidal which in general is better for EMI. Is this a major contributor to keeping the EMI so low? Does PI have a design similar to this brick with info on a toroidal transformer, shielding specific to laptop bricks? If not, what does PI recommend for a low EMI solution in terms of a controller, etc? My design, layout attached.