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Message: <blockquote data-quote="thor.zmt" data-source="post: 1080571" data-attributes="member: 76961">I made a SMPS for a Stereo EL84 PP Amplifier before, including transformer design, getting everything production reliable etc.. It was based on a similar IC (also QRP) but from Fairchild. Primary and secondary windings must be interleaved and wound for low capacitance etc... It worked great once fully done, but it was significantly non-trivial and took a lot of effort. Plenty of gotchas in this, definitely not something for casual dabbling.Thor</blockquote>