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I am making an arduino controlled fan speed controller that would digitally control the speed of my ceiling fan working on VAC and 50 Hz. I am using the following circuit which is designed for VAC and 60Hz. Working:- When the AC voltage goes from zero to peak, the optocoupler is active and activates the output side. The arduino pin connected to the output of the optocoupler senses a HIGH voltage. When the pin reads a low it means we are approaching at a zero crossing of the AC mains voltage and depending upon the timing, the arduino will activate the TRIAC driver that is optocoupler MOC that will further activate the TRIAC providing the power to the ceiling fan.

My doubt is that , in the datasheet of H11AA1 optocoupler ic the absolute max forward voltage of the optocoupler is not mentioned. How is this ic working directly with AC. I understand that the current is low since there are two 15k Ohms resistors, but the voltage is still around 55VAC at the pins 1 and 2 of H11AA1. How is this IC not destroyed?? Also will the circuit work for VAC 50Hz??

What makes you think that the voltage at pis 1 and 2 is 55VAC? The max forward diode voltage is specified as 1. In your circuit the peak current will be the peak of the AC line, maybe V across 30K or around 5mA. There are safety issues with use and PCB layout of this kind of device that you have to understand, but the device itself should be fine for these applications. Sign up to join this community.

The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Ask Question. Asked 3 years, 4 months ago. Active 3 years, 4 months ago. Viewed 1k times. Rishi Sharma Rishi Sharma 4 4 silver badges 15 15 bronze badges. Active Oldest Votes. If you limit the current to a safe value you could use the circuit at VAC as well. John D John D You just made my day!!

Working with VAC is not recommended unless you really know what you are doing. Sign up or log in Sign up using Google. Sign up using Facebook.

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