Exhaust Fan in IIe Internal p.s.

[buggie@ben08.unm.edu (stephen e buggie)]

I still use IIe's at home and at the office.

Has anyone ever wondered about the sealed metal casing around the IIe
internal power supply.  It gets hot, correct?

Over the weekend, I installed a CrowFred 2" exhaust fan on a IIe p.s.

I sawed a 2" diamter hole in the upper part of the casing, with 1/2" holes
near the other end of the power supply.  I also installed a green LED lamp
on the side of the casing, connected to the +5v DC line, inside the
casing.  Colling air is now drawn into the IIe p.s., and it exits through
the top.

The IIe p.s. is upside down so the air path is blocked by the botherboard.
But ai4r goes around the board.

The +12v ppower to run the fan is tapped from large power points at the
front edge of the IIe motherboard.   They are at the lower left front
corner of the board.

It works!

The p.s. runs noticeably cooler. than with no ventalation.    I tried
loading up[ all slots with large interface cards, and the p.s. eventually
stalled (overload), foircing a reboot.  Thus, for a fully loaded IIe,
Bugg-Power external p.s. is still needed.   But adding the exhaust fan
migtht crank slightly better performance from the internal p.s. than is
otherwise possible.

[TYPOS:  I regret the typos, by this pee cee clobe lad is overloadaed,
and it takes two minutes from the time that a character is typed and the
character's appearance on the screen.  It could take half an hour to
correct the errors!!

Steve Buggie		Gallup NM 		buggie@unm.edu