AC switching circuit design

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tanzil_dhk

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can anyone help me with an ac switching circuit design.i want to control light and fan using a microcontroller. are DIAC and TRIAC must for this type of circuit??
 

Use off-the-shelf solid-state relays (incorporate zero-crossing detector, optocoupler and triac) which can be controlled directly from microcontroller pins, or use discrete components such as optocouplers (MOC-series, for instance) and triacs to build one .. see picture below ..

**broken link removed**

Regards,
IanP
 

you can use the triac for dimmer lamp, optocouplers if you want to separated the control circuit and load circuit.
 

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