Hi, I'm using an LM2672 Fixed 5V (up to 1A load) regulator in a project. The regulator has specific requirements for the input capacitor ie low ESR, RMS current rating >= 1/2 DC load current, at least 15uF if solid tantalum is used. The input voltage for the board is 12V (from an external ac adapter) and is brought in onto a power plane. The 5V regulator shares this power plane with 8 external proximity sensors, 9 solenoids, and 1 photoeye. Would two 1 ohm resisters in series with the regulator's connection to the power plane provide some isolation from the other devices so that the input capacitors are only used for the regulator? Or is this something I shouldn't even be worrying about? See the attachment for a better idea of what I'm trying to describe. To be honest with you I saw something similar to this done before and I thought "hmm...I wonder if that's why they did it..." and so I figured I'd ask the experts.