Stuart Meier wrote:

>Built a few Solid State Relays like this the other day. Once I sorted them out
>(nasty stuff 240v!) they work a treat. Saves the clacking of those relays....
>
>I'd (A) reduce R2 a lot I was using MOC3020s driving less sensitive gate triacs,
>with the load on the highside. I had R2 at 360R (B) I would check I had the
>triac the right way round (MT1 v MT2) (C) I split R2 and put a 0.01u 240v cap
>from the centre to neutral so they could (I hope) deal with some inductance in
>the load.
>
>

A word of warning here. The "240v" capacitor *needs* to be the
type meant for the application. Don't use normal greencaps even
if they are rated at 630Vdc. Use 250V "X2 class" types as these
are the only types that are safe to use in your application.
David...

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