Re: time delay switch

[Smitty Two <prestwhich@xxxxxxxxxxxxx>]

In article <Pine.GSU.4.58.0708180925320.23195@xxxxxxxxxxxxxxxxxxx>,
 Lacustral <lark@xxxxxxxxxxxxx> wrote:

> I'm looking for a delay switch for a bathroom fan and I haven't found any
> that have exactly what I want -
> - adjustable time interval from a few minutes to, say, 1/2 hour.  I'd
> rather not get one that just has a few choices for time interval.  You can
> get one that gives you 5,10,15, 30 or on-until-switched-off choices, but
> I'd like to have it completely adjustable.
> - time delay interval controllable on the outside of the faceplate
> - doesn't make noise.  Spring timers all click as I've heard, so not a
>   spring timr.
>
> What the delay switch does, is you can leave the fan on after you leave
> the bathroom, for an adjustable time.
>
> The closest thing I've found is this:
> http://www.rewci.com/fandetisw.html
>
> It has a delay of up to an hour.  I don't know why anybody would want to
> keep the fan on in the bathroom for an entire hour after leaving, but I
> guess it's conceivable.  So I'd live with that.
>
> But it's designed so the time delay adjustment is hidden behind
> the faceplate, and changed with a screwdriver.  I want to have the delay
> adjustment on top of the faceplate.  So there would be a sort of
> screwdriver blade attached to a knob, anchored to the faceplate somehow.
>
> Any ideas about how to do this, so it would work reliably?
>
> Alternatively, I'm sure it's possible to get a circuit that will do the
> delay function.  If the guts of it could be covered over so it looks nice
> - I could buy a wood faceplate and cut circular holes in it for the
> knobs - that would
> also do.  It would have to fit in a gang box, or whatever they call the
> metal box that switches are enclosed in.
>
> Laura

Omron makes some nice stuff. Here's a pic of a timer I use in the shop.
It's shown set for 0 to 3 seconds, selectable by the large dial. But the
range can be set as 0 to 1.2, 0 to 3, 0 to 12, or 0 to 30. And the units
can be seconds, minutes, hours, or 10 hours. So altogether, it's a timer
that can be set up for 0 to 1.2 seconds, all the way up to 0 to 300
hours. All of that is front panel selectable. There are also several
different logic modes, e.g., how it's triggered and what type of input
causes it to latch, when the timer starts, etc.

http://members.cox.net/prestwich/timer.jpg