Noobian:
The opto-isolator in that circuit is a 4N35 right? isn't that used for DC ?
Yes it is, because that dimmer is using MOSFET control with DC supply.
Must be wrong link.
A MOC3020 should be fine.
Tom... 
Noobian:
The opto-isolator in that circuit is a 4N35 right? isn't that used for DC ?
Yes it is, because that dimmer is using MOSFET control with DC supply.
Must be wrong link.
A MOC3020 should be fine.
Tom...