DIYbanter - View Single Post - 12v 300ma transformers to power pc case fans?

Jim Yanik

(Michael Black) wrote in
:

"Ancient_Hacker" ) writes:
wrote:
I have a few old transformers that output 12volts at 300milliamps.
I was wondering if it was all that important to use resistors to get
the current within the stated specs for a pc case fan I wanted to
try to run on it.
I have a fan that states 0.2amps and another that states 0.45amps.
Would it matter much if I used this transformer for either of these
fans as it is now?
Or would it likely ruin either fan?

Why not use the Pc's power supply? It's there, convenient, probably
able to handle quite a few more amps of load, and automatically
switche4d at the right times.

I assumed the fan had nothing to do with the computer.

Every time I pass a computer on the sidewalk waiting for the garbage
truck, I look it over. If it's recent enough and has ram, at the very
least I'll extract that. Sometimes the hard drives, and usually
(because they are easy to extract, and the cases can be used for
building other things in), the power supplies. Hence I have a lot of
fans from PC power supplies. I've made a few fans for the warm weather
out of them, and have used AC adaptors to power them. They work fine,
and often create enough of a breeze without me feeling like I'm facing
a major storm.

Michael

I used two salvaged PC fans after Hurricane Charlie,Aug.13,2004,to keep
cool(Florida in August!) when my line power was out for 7 days. I powered
them with a 12v/20ah gel cell.It also powered a small fluorescent lamp.

The fans really helped at night when trying to sleep.

--
Jim Yanik
jyanik
at
kua.net