Re: AC Fan use in PC??


"Michael A. Terrell" <mike.terrell@xxxxxxxxxxxxx> wrote in message
news:4447C403.8B4E66F5@xxxxxxxxxxxxxxxx
John G wrote:

"Michael A. Terrell" <mike.terrell@xxxxxxxxxxxxx> wrote in message
news:44474C59.1E29B4FE@xxxxxxxxxxxxxxxx
Splork wrote:

Other than having to wire a separate external circuit for them,
are there any reasons for not using 120v fans in a PC?? I have a
bunch of good quality units as well as what is needed to mount and
wire them.
Quiet and powerful relatively speaking.

Any drawbacks via radiated AC EMF noise??


The original IBM PC and XT supplies used AC fans.


And they were contained INSIDE the powersupply that even had tamper
proof screws to prevent silly people getting electrocuted on the
supposed safe 120 volts.

12 volt fans have obvious safety advantages when scattered around
inside
the general case.

Oh! and those power switches were mostly carefully insulated, but
better
practices have evolved so ancient things are not always the way we
should stick to just because they worked when we did not know better.
Real IBM AT power supplies had the switch within the powersupply
case.
It was only cheap Taiwan knockoffs that had remote AC switches.


So, you've never seen a properly installed AC fan with the insulated
plug in connector or finger guards? Its a pity that your education is
so lacking. Real computers have air filters on their AC fans. Too
bad
you've only played with toys. Some of them have the DC fan mounted
outside of the "Metal Box", and have no finger guard.

BTW, there never were any "REAL IBM AT" power supplies. IBM never
made a power supply for the AT because they all came from outside
vendors. The same vendors that made the power supplies with external
power switches made supplies for the crappy AT case with the switch on
the back corner of the case. If that design was such a good idea, why
did IBM abandon it on their PS/1 PS/2 and Aptiva computers?



Michael,
There is no need to get personal. I only mentioned a few facts.
Yes I fixed IBM mainframes for many years (1440 onwards )before the PC
was announced and yes they had 120 volt fans as you say.
The PC was designed for a different market and had some stricter safety
objectives.
Some of the later IBM PC PS/2 etc had the power switch still inside the
power supply but operated by a push/pull wire from the front panel still
to keep all the mains AC within the PS box.

Times have changed some for the better some for the worse.

Have a nice day.
--
John G

Wot's Your Real Problem?


.

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