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I looked at the 'dancing sine' video. That's probably normal with the AD9833 at that setting. Your Rigol is showing 8MHz, so you're right at the max limit that the DDS can produce with a 24MHz clock, as you're only getting 3 samples per sine. The anti-aliasing filter is doing it's best to...
I've used real Kapton polyimide (lots and lots) and cheap knock-off stuff. Both worked; the real stuff held better under reflow temperatures than the knock-off brand did (not a big surprise, there). Same goes for the glue on copper tape: 3M has some of the best adhesives around, so their tape...
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