Essentially yes.

Practically you want to turn the triac on when the AC phase is at zero 
(google "zero crossing detector") or you will get lots of interference.

I used a winding of a small mains transformer buffered by a transistor to 
detect the zero crossing when I built a PIC controlled washing machine.

Dom
----- Original Message ----- 
From: "John Waters" <john_fm_waters@hotmail.com>
To: <piclist@mit.edu>
Sent: Friday, September 08, 2006 9:41 PM
Subject: [EE]: How to use Triac Output optoisolator


> Hi All,
>
> I want to use a Triac Output optoisolator like the MOC 3023 to turn on/off
> 110V ac supply to a load. Do I just apply a dc voltage to the input diode 
> to
> turn on the output triac (so that ac current will flow through the load) 
> and
> apply a 0V to the diode to turn the triac off (no current flows through
> load)?
>
> Thanks in advance!
>
> John
>
>
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