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AC Load control using infrared and microcontroller

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Newaj

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Hi, i am new in this forum. i am a 3rd year electrical engineering student and trying to build a voltage controller using triacs, microcontroller and a tv remote. but i am facing problem in isolating the ac from dc without using relay and how to control triac using 5V dc signal. :confused:
Could anyone please help me on this problem?
 
Thank you, Nigel. I am trying to vary the speed of fan using microcontroller. how can i change the resistance of variable resistor?
**broken link removed**
can we use moc3020 for just switching instead of relays?
 
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