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Hi Donh56, Thanks for sharing your experience. I'm planning to add a fuse or breaker before my diy hypex stereo amp (nc252mp), since I'm not confident that I can replace the onboard fuse. Do you have any suggestions if I should use a fuse or breaker? and do you think the impedance of the fuse or...

May I ask what is that copper colored thing on the bigger smps transformer?

Thanks for your reply! But why double inslulate one side only? Is it because the smps side is "high voltage" zone and the amplifier side is low voltage (below 60v I assume)? I just built a nc252mp amp with the Ghent audio kit and I noticed that the transformer that sits right on top of the smps...

Sorry dumb question, why is there a plastic film between the thermal pad and the aluminum base plate? Isn't the MOSFET already isolated from the aluminum base by the thermal pad?