You will _never_ successfully trace a schematic you
don't
understnad.
I think that's a bit of an overstatement. There have been
devices
that I understood not a lick until I sat and studied the traced-out
schematic for some time.
yes, those mains light switches are complicated...
That's pretty funny. You see, the device I had in mind when I wrote
that was in fact a mains light switch.
(An X-10 remote-controllable one. But still a mains light switch.)
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