470 ohm resistor burned in TRIAC switching circuit

Suyog's picture

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Joined: Sep 02, 2020

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470 ohm resistor burned in TRIAC switching circuit
December 25, 2020 - 11:42am

I am using a voltage divider circuit to control the speed of the AC Fan. Instead of using a relay, I am using a TRIAC for switching. The switching is controlled by ESP32 through an optoisolator(MOC3043). According to certain references from google and youtube, I discovered that we need to connect 470 Ohm 1/4W resistor at pin no 6 of the optoisolator. But when I switch the TRIAC for operation the 470ohm resistor burnt completely and it is happening to all the resistors. Can someone help me with this problem? Thanks in advance.

Sourav Gupta's picture

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Joined: Feb 12, 2018

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Use 2.2k resistor with 1/2 watt rating. What is the part number of triac?