> > for energising a relay at its nominal voltage and keeping
> > it closed with a holding voltage, which can be 50% of the

>Thanks Jinx, but reading your page, came to me the idea I
> said about the 24V relay connected directly to the 110V mains,
> using a diode and a resistor to drop the current. I think I got a
> winner here, I'll do some tests today ;o)

With the opto-triac for on-off control not much to go wrong there.
My other thought would have been to have a cap supply for just
the relay so there are no glitches on the 5V supply. I can usually
find large (1-2uF) ones that I need in old SMPS or TVs

I'd like to know this though. Which has the lower MTBF - X2 cap
dropper or high watt resistor dropper ? I suspect the hi-W R for
heat reasons but that's just intuitive and probably has more to do
with PCB layout

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