Doug, > 1+ Volt peak-to-peak spikes on the scope at the fundamental switching frequency of the power supply. > What is the first thing you do?> Doug Smith 1st thing I'd do is connect both probes together at each P.S. terminal, one at a time, and see if the noise goes away.If it doesn't, that 1Vpp reading is due to your measurement set up. It's a baby step, but it's served me in the past. Colorado Brian
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