[Coco] Coco 2 64k - heat issue?

[Bill Pierce]

I have a fan in my Coco 3 to cool down the 1-meg expansion. It's basicall the same fan you might find on a modern CPU. It's hooked directly to the supply, but I can't remember if it's 5 or 12 volt, but I think 5 volt. It's hooked after the power regulation circuit.
This works fine on a Coco 3 as the power drain from the MB is much less than the Coco 2 (newer chip technology). The Coco 2 has always had a "marginal" supply, so I suspect it would need external power for a fan.
As a note, my fan is located inside  the Coco, below the keyboard area on one of the bottom vents (left) and since I have a AT keyboard adapter, the keyboard has be replaced by a flat panel, so there's plenty of room. With a "flatter" fan, it would probably fit under the keyboard, but the keyboard would probably block the air flow to the memory board. All other vents are taped over (from the inside) except those over the memory board. The fan pulls air in through the bottom and forces it past the memory board and PS taking the heat out the vent above it. My Coco 3 is barely ever more than a little warm to the touch. The same goes for the 1-meg memory and PS. This Coco 3 is turned on every morning and usually runs most of the day and evening.

 

 


Bill Pierce
"Charlie stole the handle, and the train it won't stop going, no way to slow down!" - Ian Anderson - Jethro Tull

 

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-----Original Message-----
From: Al Hartman <alhartman6 at optonline.net>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Sun, Jun 28, 2015 10:40 am
Subject: Re: [Coco] Coco 2 64k - heat issue?


I bought an AC powered fan and simply tapped the incoming AC power. No need 
to
worry about overtaxing the power supply at that point...

-[ Al
]-

-----Original Message----- 
From: Robert Hermanek

I've always wanted to put
a permanent little muffin fan inside the case,
taking power from somewhere... is
there a safe place in a coco3 to grab
a little voltage with clipleads, either 5V
or 12V or something, and how
many mA could the fan be without interfering with
anything?  Or... so
there no easy access, or no surplus power, inside a coco?



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