If any of you decided to build the yard light timer I posted on my web
site and entered in the PCB contest (doubtful, I admit, but not
impossible):

I discovered today that there is an error in the schematic and the board.
One of the MOSFETs is bass-ackwards.  It will work under a light load, but
will fail rather spectacularly with 70 or 80 Watts load on it.  The old
in-ground cable had developed a short and I had not been able to live-test
the board I hand wired until I got the new cable in today.  With six of
the lamps connected and turned on I went back to check the unit after
about an hour -- there was a noticable odor from a few feet away, and a
thin curl of smoke coming from the board.  To its credit, it was still
working, though I think one of the MOSFETs may be toast.  Anyway, I've got
the schematic and PCB corrected and will try to get the web site updated
ASAP.  In the mean time if you build one, just reverse D and S on one of
the MOSFETs - either one.

I had tested the board earlier, but due to the real light string being
unavailable I had used whatever I had around the shop for a load, and had
not been able to get more than a couple of Amps through it.  At relatively
low currents it appears to work fine, though I probably would have seen
something odd if I'd scoped everything like I probably should have.

Dale
--
"Curiosity is the very basis of education and if you tell me that
curiosity killed the cat, I say only the cat died nobly."
          - Arnold Edinborough

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