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Looking at the design Bruce the 1M pot (P1) resitor varies the duty cycle so you can try different duty cycles.
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Yes, but the pulse frequency is always one pulse per second (with variable duty cycle), this means on low setting it will get a tiny blip of power once per second.. I'm probably way off beam but I thought maybe that was too slow and would allow the element to cool too much before the next pulse.. eg rather than a nice low even heat you would a more pronounced heating & cooling cycle which might not be as good?