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OCAU News |
Peltier on G3 Mac
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Monday, 13-March-2000 14:42:00 (GMT +10) - by Agg
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This is a little old, but this article from Oct-98 shows a guy using a 10W peltier to overclock his G3 macintosh. Pretty interesting, thanks to Chris for the link. Here's some snippage:
Several tests I performed on the cooler assembly convinced me of 2 things - the heat output using 12v is beyond the reasonable capacity of the heat sink & blower (in other words, it got too hot IMO), and the other voltage available, 5v, didn't provide enough cooling. If the resistance of the PJ stays constant the amount of cooling will be proportional to the square of the voltage that's applied, and 7v would give 2X the cooling of 5v, 8.7v would give 3X, 10v, 4X, ect. To the best of my recollection the G3 cpu generates about 5w of heat so I chose to design a 10w Peltier cooler. The PJ had an internal resistance of about 5 ohm , so a resistance load of 3.3 ohm in a 12v circut would drop the voltage to the PJ to just over 7v and yield 10w. The load was made by putting three 10 ohm power resistors in parallel in the circut. The resistors will get quite warm, so were mounted in a "tree" behind the internal speaker so as not to touch anything in the case.
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