> There's probably some reason it's difficult to find a circuit for
this,
> but the annoying thing about having so little knowledge is that it's
> easy to imagine the circuit must be simple  :-)
Well, this first one is a lighting controller - but it is a
zero-crossing one, although there is a caveat about inductive loads
requiring a "nicer" sine.
http://www.ubasics.com/adam/electronics/doc/phasecon.shtml 
http://www.geocities.com/budb3/arts/eltron/motcntrl.html 
http://www.st.com/stonline/books/pdf/docs/3566.pdf 
Afraid I've forgotten the intended application...!
Peter
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