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I found some surface mount 250v 1.2uF caps for $1.50 each or so on Mouser. Is this the RC snubber I've heard about? I think they do do this on mosfet based controllers, but I don't know. I'm confused by how it works. Nevermind. I drew a picture and I think I get it now. the capacitor discharges while the mosfet is ON, and acts like a shock absorber when the mosfet suddenly gets turned off.
I think I'm wrong about the capacitor value. Choose a convenient resistance. Let's say 1 Ohm. Then choose a 10 pF cap. Put them in series, and connect it from drain to source. I think that's how it should work. I don't know, though.
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