Ultra-quiet PC colling; a different approach

[danial stocks]

Peltier devices are prone to failure due to thermal stresses of heating and 
cooling.. while adjustment of current can control the heat pumping action, 
you then end up with a hefty current source dissipating lots of heat. 
switching on/off in small amounts [ie seconds-minutes] is very bad - this is 
where the thermal stress factor really takes hold! the recommended way to 
achieve temp control on a peltier is to use a PWM at 2Khz or thereabouts
Cheers,
Dan
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