[Noisebridge-discuss] N00b question - changing power supply voltage

[Corey McGuire]

If the power supply can deliver 24volts at 9amps, it would be no less happy
than if it was providing 12volts at 9amps with a few voltage regulators.
Voltage regulators seem like the least ideal way to go.

ADDITIONALLY, TEJ's that I've seen are designed, actually, for 18v.  This
seems to be the standard.  Just because they were marketed for a 12v power
system doesn't mean they can't be used for something more.  Find the source
of your TEJ's and read their papers.

If you want to get crazy, so long as they don't get too hot, there is really
nothing preventing them from taking more voltage.  An "18v" TEJ can probably
take 24v...but I won't take responsibility if you smoke them ;-)

The trick with TEJ's is that you need a TEJ that uses *AT LEAST* as much
power, in watts, as the heat you are trying to dissipate, in watts, and then
you need a slug of metal that can easily dissipate all that heat.  You
REALLY need to over design your cooling system.

So, whatever you are doing, using two TEJ's in series will allow not just
for double the cooling power, but also double the surface area for heat
sinks.  This fact alone makes me side with the "run two in series" folks.

On Thu, Jul 1, 2010 at 7:27 PM, Ryan Castellucci <ryan.castellucci at gmail.com
> wrote:

> That would work, but the power supply may get unhappy (depending on
> the type, either very hot, or shut itself off) about having so much
> current drawn.
>
> On Thu, Jul 1, 2010 at 7:25 PM, Thor <himynameisthor at gmail.com> wrote:
> > Oh hey, what about just running two in series? Double the cooling without
> > any additional circuitry =)
> >
> > --
> > Heph
> >
> > On Jul 1, 2010 7:05 PM, "Ryan Castellucci" <ryan.castellucci at gmail.com>
> > wrote:
> >
> > At that much current, the voltage regulators are likely to *extremely*
> > hot.  You'll probably need a heat sink and fan to keep them from
> > melting.
> >
> > On Thu, Jul 1, 2010 at 6:03 PM, Sean Cusack <sean.p.cusack at gmail.com>
> wrote:
> >> Awesome - thanks guy...
> >
> > --
> >
> > Ryan Castellucci http://ryanc.org/
> >
> > _______________________________________________
> > Noisebridge-discuss mailing list
> > Noisebridge-discuss...
>
>
>
> --
> Ryan Castellucci http://ryanc.org/
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