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

[Corey McGuire]

Of course, I mean linear voltage regulators.  Switching would just be pricey
and complicated, but happy and efficient.

On Mon, Jul 5, 2010 at 8:08 PM, Corey McGuire <coreyfro at coreyfro.com> wrote:

> 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/
>> _______________________________________________
>> Noisebridge-discuss mailing list
>> Noisebridge-discuss at lists.noisebridge.net
>> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.noisebridge.net/pipermail/noisebridge-discuss/attachments/20100705/47d2e3c6/attachment-0003.html>