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  1. #1
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    Dimmer lamp 220v ac (resistor values)

    Hi,
    Im new to electronics so i have some issues on reading datasheet

    I want to control a halogen lamp using triac (Q4010L5) and optocoupleur (MOC3021).

    I want to know the best value for (R1-R2-R5), to not dammage the triac and optocoupleur.

    "I didnt mention here the zero crossing detector part that will give implusion to RB1".
    Thanks for your time.
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  2. #2
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    Re: Dimmer lamp 220v ac (resistor values)

    Similar projects are discussed in related threads listed further down this page.

    A halogen bulb is different from ordinary incandescent type. Here's a discussion which brought up the advisability of dimming a halogen.

    https://www.edaboard.com/showthread.php?385899



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  3. #3
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    Re: Dimmer lamp 220v ac (resistor values)

    if you want to limit the max gate current to 1A say, then R1 + R2 = 325 ohm, note they must be rated for >200V each to avoid them breaking down ...



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