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I have built TRIAC circuit below which I got off the internet. Without the snubber circuit works good, but with snubber the TRIAC is always on. I'm using 9v ac just for testing purposes. Can someone explain why snubber makes it so TRIAC is always on?

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    \$\begingroup\$ elec.canterbury.ac.nz/intranet/dsl/p90-links/doc-include/… I guess this will help \$\endgroup\$
    – N0m4d
    Dec 20, 2020 at 18:26
  • \$\begingroup\$ R2 is too big for 9VAC. May be opto is not closing? \$\endgroup\$
    – user263983
    Dec 20, 2020 at 18:46
  • \$\begingroup\$ What is the load? CX1 will have an impedance - maybe this is what you're observing? \$\endgroup\$
    – Kartman
    Dec 21, 2020 at 10:05
  • \$\begingroup\$ @user263983 how big should R2 be? \$\endgroup\$ Jun 5, 2021 at 12:36
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    \$\begingroup\$ @ChristianidisVasileios Did you want to ask "how small"? Opening voltage divide by minimum gate current. Good luck. \$\endgroup\$
    – user263983
    Jun 5, 2021 at 14:00

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