Re: How to Power a Stand-Alone Case Fan

On Dec 10, 2:33 pm, Terry <kilow...@xxxxxxxxxxx> wrote:
On Mon, 10 Dec 2007 13:28:43 -0800 (PST), "carey...@xxxxxxxxx"

<carey...@xxxxxxxxx> wrote:
Hi:

I want to use a computer case fan for ventilation in an animal cage
and am looking for advice on what I should use for the power supply.

It's a 12 V, 100 milliamp fan and I am looking for a solution that
doesn't cost a lot more than the fan itself, preferably the cheapest
practical solution. Most everything I can find on-line assumes you
have a computer power supply to plug your fan into.

Have you considered mounting a generator on the axle of the hamster
wheel?

No good. Animal is too lazy.

Or maybe a battery?

That would work, but they have this nasty habit of running down and
needing to be replaced.

Lets see, 8 alkaline D-batteries ($1 each at discount outlets) provide
12 V for 16500 mAh, which last about a week. But then I would be going
through 52 sets a year, for a toatl of $416 or so. Hmm... not the best
option. Maybe the animal won't live long, which will reduce the cost.

The suggestion of getting a Radio Shack plug-in transformer power
supply may be the only reasonable option, but I've already priced that
at $19, more than twice what the fan cost. I wondered if there might
be some cheaper component that would do the job.

Maybe I could get an equivalent power supply at Fry's for
substantially less.

.

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