[Coco] How much power does the Color Computer use?

theother_bob theother_bob at yahoo.com
Mon Sep 7 08:33:15 EDT 2009

----- Original Message ----
From: "jdaggett at gate.net" <jdaggett at gate.net>
To: Brian Goers <briang0671 at sbcglobal.net>; CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Thursday, September 3, 2009 1:50:27 PM
Subject: Re: [Coco] How much power does the Color Computer use?

On 3 Sep 2009 at 12:40, Brian Goers wrote:

> Has any one measured the actual current flow for the different voltages
> the color computer uses? 5V, +/-12V, -8V.
> What is the total power draw? Has anyone actually used the CoCo 2/3 as a
> laptop with LCD powered separate from the computer?


>From the technical manual typical draw off of AC mainis about 200 milliamps. That yields 
a power draw of about 24 watts on average. Also from the schematic based on the 
current limit resistor value and the max current spec for the pass transistor about 2.5 
amps draw off the +5 VDC line is safe maximum. That would yield about 13 to 15 watts. 


I measured it when I converted a CC3 to run off 12vdc. 
I didn't measure the 5v or 8v current individually though.
The total draw for the CC3 by itself at 12vdc (from memory) is about .78A..
Once I added the slimline FDD (5v) and controller, it rose to about 1.2A.

Although I didn't measure it, looking at the 8v circuit, it looks like there's
very little load there and I had no issue connecting a 12v pentium fan to it.
That dropped fan noise from a loud whisper  to virtually inaudible.

I think I posted more accurate data at the time if you search this forum.
Would have been around 12/04.



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