Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
If the gate voltage of the triac is less as required as per the spec this can happen. Provide a 4.7 mfd cap from the gate of triac to gnd the voltage rating of the cap should be 3 times more than the voltage present on the gate of the triac.