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If you mean R6 it is probably trouble with C1.
What voltage rating is marked on it. You need one rated at more than 125V AC.
Brian.
The triac should be OK but if you imagine what happens when the triac is turned off, the full AC is applied across R6 and C1. If C1 breaks down because of the high voltage it puts the full AC across R6 and it dissipates about 6W of power. The capacitor must be able to withstand more than 125V and importantly, it must be rated for that voltage AC. Most capacitor ratings are for DC only. If you can find an X2 class capacitor it would be safest to use.
Brian.
Yes, it's necessary to put a rectifier bridge, or you can use doubles back to back SFH615i am using following circuit for ZCD, When i use an opto coupler like SFH615 is it neccessary to use bridge rectifier ?.
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Not necessarily. There are two considerations:i am using following circuit for ZCD, When i use an opto coupler like SFH615 is it neccessary to use bridge rectifier ?.