Hi, distributed brains.

Has anybody used microchip's TC652 fan controller? That seemed like a
very simple/safe way to slow down fans of my PC, but somehow I can not
get it to work as intended. Circuit is just like the one described in
TC652 demo board users guide.
Fan is running, but fan fault detection does not work at all, and
temperature control seems very erratic.
Circuit is very sensitive to my hand nearby it, even without touching it.
5V power comes from a cheap wall wart, which was good enough for all
kinds of PIC circuits before. 12V for a fan comes from another wall
wart.
There is a big cap across the 5V power.

Unfortunately I have no scope available now.

Any ideas?

--
KPL
--=20
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