[Coco] Adding a CoCo 2 Case Fan

[David Grimmel]

I do a very simple non invasive setup on my coco3. I have a hi-speed smaller fan from an AMD socket7 cpu cooler sitting on top of the vents, closest to the power supply. 4 small rolled pieces of black electrical tape on each corner to keep it put on top of the coco. Then I took the two leads and hooked it to an old ac/dc cheap radio shack multi-voltage adapter. I can adjust the speed of the fan by changing the voltage switch, anywhere from 3v to 12v. around 5volts is a gentle breeze and nice and quiet. 12v is like a hoover vacuum sucking out any trace of heat. Its also easy to remove if needed and doesnt hack up or need any power from the coco. And I can turn it off completely if I dont want it on making noise. Theres a small pic here with it visible on my coco3...
http://groups.msn.com/davesphotoventures/cocomagnets.msnw?action=ShowPhoto&PhotoID=2548
 
Dave > On Friday 18 April 2008, Chad H wrote:> >I was wondering how those of you who have installed cooling fans in your> >original CoCo cases have done this. Where did you draw the power? Using a> >multimeter I measured the A/C transformer output at approximately 18VAC, not> >a common type for fans. 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,> >receded out of site, and blowing right over the heat sink that seems to be> >the hottest thing in the case. Since I couldn't determine a power source> >safe to use off of the CoCo motherboard, 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.> >> >> >> >I would like very much to hear the ideas other have come up with on this.