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Dimmer problem pls help

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takbbb

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dimmer problem

1555_0001.jpg

my mcu drive the above dimmer in 12Vac

however the gate signal is greatly affect by the triac

and it's lost in control .

The gate and the MT1 signal are so low in impediance (abt 50-100 ohm)
and the MT1 signal feedback on the triac gate termianl. . .

how to solve it?
 

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