Tim ODriscoll wrote:

>Hi Everyone,
>
>I'm having a few problems getting my triac to turn on through an
>opto-triac. More specifically, the opto-triac is turning on and putting
>mains voltage at the triac's gate, but the triac won't start conducting.
>
>A schematic:
>
>+5vDC                                       240vAC (live)
>|-R1---LED1---|     |------R2-----|------------|
>              |     |             |
>             LED2  TR1           TR2
>              |     |            | |
>--------------|     |------------- -------LOAD-|
>Gnd                                           Neutral
>
>R1     200 Ohms
>R2     5.6K
>LED1   Red indicator LED
>LED2   MOC3041 opto-triac
>TR1    MOC3041 opto-triac
>TR2    BTA16-600 Triac (16A, 600V)
>
>

R2 is usually 680R IIRC. The MOC3041 datasheet should show
a standard circuit with typical values.
David...

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