[Coco] Adding a CoCo 2 Case Fan

[Bruce W. Calkins]

> I was wondering how those of you who have installed
> cooling fans in your original CoCo cases have done this.

I have only mounted two fans in CoCo cases.  A 120 volt pizio crystal 
DragonFly fan in my original CoCo 1 and a 1.6 inch fan in my main CoCo 3.The 
DragonFly



> Where did you draw the power?

The DragonFly was connected to the AC side of the transformer.  I shut the 
whole system down with the switch on a power strip.  For the CoCo 3 I ran a 
pair of leads to the 12 volt supply of my hard drive case.


> I'm considering doing one more mod to my CoCo by
> taking a 40mm fan and placing it just inside the left side of the case,

The DragonFly in my CoCo 1 was placed on the underside of the top of the 
case with double sided tape, oriented to blow across the transformer.  More 
or less to pull air from the right vent and encourage it out the left vent.



On the CoCo 3, I cut out a section of vents in the top of the case and 
wedged the fan in blowing up and out.  IIRCC, it was over the 512K memory 
expansion board.



> Since I couldn't determine a power source
> safe to use off of the CoCo motherboard,

My understanding is that there is no safe place on the mainboard to draw 
enough power for a radial fan.



> I'm considering taking a small A/C to 12VDC board and
> mounting it inside the case and running the A/C inputs to
> a switch by the fan and the same A/C input leads used by
> the CoCo transformer.

A 6 to 12 volt DC wall wart should do well.


> I would like very much to hear the
> ideas other have come up with on this.

One could take the wall wart apart, but, why?



> -          Chad

Bruce W.