Re: [ATM] Electronics help needed - temperature control

["Don Clement" <clement.focuser@verizon.net>]

It should be possible to modify my automatic dew heater circuit
http://mysite.verizon.net/res0owmd/id1.html to control 12V fan(s) against a
fixed temperature. Replace D1 with a zener diode, say 5.7V.  Cut the
connection from R6 to R2,D1 and rewire R6 to the wiper of pot R3.  Swap
terminals 2 and 3 of  U1. Connect the fans where the heater H1 is. Adjust
pot R3 to the desired  fixed temperature.

Don Clement
Running Springs, California

> Hi Gil,
> Don Clements designed a circuit to control a dew
> heater for secondaries and finders and such. I can't
> see any reason why it would not work for controlling a
> fan. Power consumption or current might be an issue,
> but I couldn't address that. Perhaps someone else
> could?
>
> Don's site:
> http://mysite.verizon.net/res0owmd/id1.html
>
> There's a link from Don's site to Ken Lowther's page
> for a printed circuit board.
>
> I've printed up and etched a 6-pack of those boards
> and have wired my first one up. So far so good.
>
> Dave
>
> --- Gil McFarlane <gilboastro@yahoo.com> wrote:
>
> > I am working on a way to control mirror temperature
> > and want to have a cooling fan (12V) that turns on
> > when temp is above a certain level (that I can set).
> >
> > My son was working on this for me - but he had to go
> > back to college!  (Kids now days.)  Does anyone have
> > any suggestions?

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