EDIT: DIAC part numnber is DB3TG
I'm trying to understand how a dimming circuit works, specifically TRIAC control. The TRIAC (D1) in this circuit is a BT136S-6. Where does the Gate Trigger Current come into play? I understand that the combination of R1/R3/C2 control the time that C2 is charged up and therefore hits the threshold of the DIAC (D2). Is the TRIAC just consuming full power at trigger point? Is that bad news? Should the gate current be limited by a resistor?