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Dimmer problem please help~

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takbbb

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I make a 12Vac dimmer useing hotlek mcu to drive the triac

the circuits are in the attached. . . .
i get problem when i get fire to the triac then the 12Vac was distorted.
And it casse me cannot detect the zero crossing ...

anyone can help thx!!

normal 12V ac when triac was not fired
DSC03271.jpg


distorted 12Vac when triac was fired
DSC03270.jpg
[/img]
 

oddbudman

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Whats your load?

Perhaps plot your zero crossing detector toggle on channel 2 vs ac on channel 1.

oddbudman
 

manish12

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where is the circuit ?

upload it again.

tips :- use fan dimmer before transformer , it is simple too
 

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