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Interesting!

Thanks for the schematic. Adding the filter cap makes the Output looks more SET friendly. It looks much like a DC with high ripple on both sides due to the Diac firing on both direction.

I don't see any square wave like in that scope trace so the ripple is all that is making that of the AC heated DHT?

Whatever the case, that output looks much more amp friendly than the square waves I have seen before.

I think you can reduce the ripple by a considerable amount if you put a larger uF cap behind the rectifiers.
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