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TRIAC based on/off circuit showing flash problem with LED lamp

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getfast_kiran:

--- Quote from: capt bullshot on March 07, 2017, 09:55:59 am ---
--- Quote from: getfast_kiran on March 07, 2017, 09:04:34 am ---I tried the second option you suggested. I removed the 100n caps and replaced it with a 22n(Triac) and 47n cap(for optocoupler) caps instead of 10n since I only had those with me.
Now the problem of flashing of LED is gone. I am wondering how much it will affect my snubber circuit performance and what could be the possible tradeoff.

--- End quote ---

As always: it depends ...
The primary reason for having a snubber across the triac is to limit the dV/dt to keep it from turning on unwanted. As long as it doesn't turn on when it's supposed to stay off, the snubber is sufficient. A well behaved load may not require a snubber at all, but there's still the power line as a source of transients which could turn on the triac randomly. There are some standards for lab EMI testing, you'd optimize the snubber under these conditions in an EMC lab, supposed you want to sell your product. If you don't intend to sell your circuit, use whatever components you like as long as it works for you.

--- End quote ---

OKay understood what you said. Thanks so much for providing the viewpoint in terms of a product to sell or self use. Information was so useful to think about and move forward.
Thanks again to you and all those who helped.

venkaty:
Hi getfast_kiran, Could you please share us your working circuit(which is fixed of TRIAC based on/off circuit showing flash problem with LED lamp)

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