V G wrote:
>> This is why Peltier coolers are usually driven by what amounts to a
>> variable
>> switching power supply, but with enough filtering to keep the total
>> ripple to a small fraction of the average output.  Anything that
>> would qualify as
>> a
>> regulated power supply for other purposes would likely be good
>> enough.
>
> Yes, I did read it, but all I got from it is that I should use a
> smooth DC source. I don't care about efficiency, since it doesn't
> consume much power anyway, and it will get power from a computer
> power supply (12V rail or wahtever).

You better check what your computer power supply 12V output is rated for.
Peltier coolers use quite high currents, which could easily be more than a
common computer power supply 12V output is rated for.  If you just want to
drive the Peltier at 12V, then a car battery charger would be better than a
computer power supply.

Even if you don't care about efficiency, you still have to consider how to
get rid of the heat caused by the inefficiency.  Sometimes a more efficient
solution is simpler and cheaper because of that.

> And for starting purposes, since the goal is to get the drink as cool
> as possible as quickly as possible, a direct, uncontrolled 12V line is
> perfectly fine, with an on/off switch.

If that's all you want, then go for it.  You will very likely need a fan
blowing on the hot side of the Peltier though.


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