Hi all, I am playing with the AC control with triac and want to control AC motor and bulb using Triac,

I made the following schematic, the first part is a zero crossing detector,

and second is the actual triac control part,


Everything works fine and OK ---- the motor speed is controllable, and the bulb also dim OK, but the problem is that,

the motor gives jerks and the bulb gives fluctuations.when I make the speed very low

So pls help me to make a smooth speed controller and a smooth AC bulb dimmer ----- I think I have to change the snubber circuit but how to make a good snubber ----- i don't know, OR there is some other issue

pls reply soon and help me

thanks in advance

thanks

 

What is the motor technology? Induction? Universal etc?
Max.

 

Are you sure the Arduino isn't trying to exert a phase delay > 180°, which would cause the triac firing to skip some half cycles?