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SCR triggering using DIAC

I've found this method of triggering of the SCR through DIAC and I'm trying to understand it. I was able to figure out the whole trigger circuit and how to compute the values of RC in order to have ...
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What is the correct method for Triac supply?

I need to know what is the correct power supply for fallowing light dimmer circuit that operate by 230V/50Hz AC supply. It should be neutral(N) to MT1 or live(L) to MT1? If can use both, what is the ...