Questions about case fan modding.

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Are there any adaptors which will have you plug the adaptor in your
ordinary household electrical outlet and then be able to attach your
90mm or 120mm case fan to it and use it that way?

The electronic device I wish to cool using the casefans does not have
anything like the plug outlet like your typical motherboard does.

If there are no such adaptors, can someone recommend a method to get
these fans to work as I would like to?  Thanks.

Re: Questions about case fan modding.

"" <Holy Moses> says...
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 Why not just use an A.C. fan?


Re: Questions about case fan modding.

On Sat, 19 Jan 2008 22:41:14 -0700, "" <Holy
Moses> wrote:

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One option is an AC-DC supply plugged into the wall AC
outlet.  A typical wall wart like you probably have powering
many of your consumer electronics devices would work, though
you will have to determine if you want full speed fan
operation or to target a bit lower voltage and if the power
supply is unregulated you will need to account for that in
the resultant voltage the fan sees since some projects don't
need particularly high airflow.

You haven't mentioned the particulars of this project which
make it more difficult to recommend the best alternative,
but whichever route you take it would require buying mating
connectors from the PSU to the fan, to substitute some other
pair of mating connectors for both PSU and fan, or direct
wire it whether that mean splicing some wires or soldering
to a PCB, etc.

Depending on the electronic device, it may have some power
subcircuit(s) suitable for powering the fan.  A multimeter
and general assessment of the circuits should tell you if
there is any place power can be tapped, and if the voltage
starts out too high but within reason, a current limitor or
voltage regulator might be placed in series with the fan.

Basically yes in general it's possible to do what you want
but we dont' have enough info  to determine what to do most
easily or quickly, nor what related tools you may have or
ability to do some things like soldering and measurements
with a multimeter.

If tapping into the existing device's power seems beyond
what you want to do, mention the fan's specs like voltage,
current, RPM, whether you need a lot of cooling from it or
not, and whether you have any spare wall-wart AC-DC supplies
lying around that you want to use or whether you'd need to
purchase one.

Re: Questions about case fan modding.

"" <Holy Moses> wrote in message
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If you are talking about a standard PC case fan then all you need is a mains
AC to DC plug pack from your local electronics store.
Read the voltage and current specs off the fan and get an adaptor with the
same output voltage and the same or greater current ability.

Alternatively connect the appropriate number of batteries in series.
Using rechargeables will reduce the running costs quite a bit.


Re: Questions about case fan modding.

On Sat, 2 Feb 2008 15:36:29 +1300, "PeeCee"

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If that AC-DC adapter is unregulated (as many are) it will
tend to float above the rated voltage.  Also, the average
current a fan uses is typically lower than the peak rated on
the label.  Therefore, consider the following example which
are real parts I've grabbed and am measuring with a

12V, 500mA generic unregulated adapter
Fan rated as 12V, 0.14A

Result is the fan gets 14.7V, and while many 12V fans can
tolerate this as it's not that much higher, it will be
addt'l noise and wear on the fan.

IMO, for a typical 12V fan using an unregulated 5V AC-DC
adapter is often the best choice for low noise, or a 9V
adapter to get closer to a 12V result.

When the above fan is powered by that adapter,

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