Dnia 23-03-2011 o 00:12:07 Mick Sulley <m...@sulley.info> napisaƂ(a):

>  I have today connected the Gnd to the earth of the mains
> wiring at each relay box, and the system seems to be running fairly
> well.

I'm not and expert but is it safe to connect 1-wire ground to earth  
ground(yellow green cable)

And for driving the the relays the same circuit should work just instead  
of +5v connect it to +12V.
I think any other popular NPN transistor would do. I use BC547


-- 
p4trykx

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