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[Reply #30 on:]

If the op want's to make one of the dimer's i post here the link to the SCH
http://www.inmojo.com/files/AMIfv956v0gqGQq4kfwh2528TEfTGlskTwl_yXylLv3GSysROxYTsc7JphvdWQo7AnoNdEK3CcHlJcEZN2PMXYG9H4LpjIw_VEETiTOi8xxiNqs-ekluFawYqmqV08UT6R9v7aZ5e9qHn69hOxmTlUpU84b1PBOGPA/ac_dimmer_schematic.pdf

And if you go down to the bottom of the page there the arduino code to run it.
 http://www.inmojo.com/store/inmojo-market/item/digital-ac-dimmer-module/

[Reply #31 on:]

Out of curiosity, if the PWM frequency was changed to something much lower, say 30Hz, would it then be possible to control the intensity via PWM? I understand its probably not going to be perfectly 'in-sync' but if the fading is fast it shouldn't matter?

You can change the arduino PWM frequency quite easily (http://www.arduino.cc/playground/Code/PwmFrequency), however I have only tried increasing the PWM in the past.

[Reply #32 on:]

You could use The PWM but it doesn't work well at all.
It's like this I tried this years ago what happens is some times you'll get a 1/2 off light next time its 3/4  then the next it jumps to off and you can see it like flickering.

Now with zero crossing you can make it soft and slow change without flickering.