BTW, do not be tempted to stage them. Staging them, one on top of the other, works only if your second TEJ can cool the sum of the first TEJ AND the original heat source. So, if your heat source is 100 watts, and your first TEJ is 120 watts, your second TEJ would need to move 220 watts of heat readily.<br>
<br>Even if your heat source was 10 watts and your first TEJ was 120 watts, you would still want your second TEJ to dissipate over 130watts.<br><br>Messy, messy stuff. TEJ's are not efficient. This is fine by themselves. When you stage them, their inefficiencies become readily apparent as they begin to compound.<br>
<br>May I ask what you intend to do with them?<br><br><div class="gmail_quote">On Mon, Jul 5, 2010 at 11:14 PM, Sean Cusack <span dir="ltr"><<a href="mailto:sean.p.cusack@gmail.com">sean.p.cusack@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Cool - these particular dudes do say 15.6V max for some reason, but I have a hard time believing that I'm going to destroy the semiconductor by throwing more voltage at them anyways.<br>
<br>I've got 7 of them, and really only need 2-3, so I'll try to smoke a couple :). Was going to do it today but got busy...with whiskey. Tomorrow should be it tho.<br><font color="#888888">
<br>Sean<br><br></font><div class="gmail_quote"><div class="im">On Mon, Jul 5, 2010 at 8:08 PM, Corey McGuire <span dir="ltr"><<a href="mailto:coreyfro@coreyfro.com" target="_blank">coreyfro@coreyfro.com</a>></span> wrote:<br>
</div><div><div></div><div class="h5"><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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.<br><br>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.<br>
<br>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 ;-)<br>
<br>The trick with TEJ's is that you need a TEJ that uses <i><u><b>AT LEAST</b></u></i> 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.<br>
<br>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.<br>
<br><div class="gmail_quote"><div><div></div><div>On Thu, Jul 1, 2010 at 7:27 PM, Ryan Castellucci <span dir="ltr"><<a href="mailto:ryan.castellucci@gmail.com" target="_blank">ryan.castellucci@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div><div></div><div>
That would work, but the power supply may get unhappy (depending on<br>
the type, either very hot, or shut itself off) about having so much<br>
current drawn.<br>
<div><div></div><div><br>
On Thu, Jul 1, 2010 at 7:25 PM, Thor <<a href="mailto:himynameisthor@gmail.com" target="_blank">himynameisthor@gmail.com</a>> wrote:<br>
> Oh hey, what about just running two in series? Double the cooling without<br>
> any additional circuitry =)<br>
><br>
> --<br>
> Heph<br>
><br>
> On Jul 1, 2010 7:05 PM, "Ryan Castellucci" <<a href="mailto:ryan.castellucci@gmail.com" target="_blank">ryan.castellucci@gmail.com</a>><br>
> wrote:<br>
><br>
> At that much current, the voltage regulators are likely to *extremely*<br>
> hot. You'll probably need a heat sink and fan to keep them from<br>
> melting.<br>
><br>
> On Thu, Jul 1, 2010 at 6:03 PM, Sean Cusack <<a href="mailto:sean.p.cusack@gmail.com" target="_blank">sean.p.cusack@gmail.com</a>> wrote:<br>
>> Awesome - thanks guy...<br>
><br>
> --<br>
><br>
> Ryan Castellucci <a href="http://ryanc.org/" target="_blank">http://ryanc.org/</a><br>
><br>
> _______________________________________________<br>
> Noisebridge-discuss mailing list<br>
> Noisebridge-discuss...<br>
<br>
<br>
<br>
</div></div>--<br>
<div>Ryan Castellucci <a href="http://ryanc.org/" target="_blank">http://ryanc.org/</a><br>
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█ ▄▀▀▄█▄▄ ▄██▄▄▄ █▀ ▄ ▀█ █▄▀▄▀▀<br> █ █▄█ ▄▄█▀▀ ▀▄▄▀█▀▄█▄█ ▀██ ▄▄▀▀ <br> ▄█▀▀ ▄▄▀ █▄▄ ▄█ ▄▄▄█ ▄▀█▄▄▄██▀▄<br> ▄▀▄██▄▄▄█▄ █▄▄█ ▄█ █▄▀▀ ███▀▄██▀<br> ▄█▀▀▀█▄█ ▀ ▀ ▀ ▄█ █▄▄ ▀▀▀ ▀▀ ▄▀▀<br> ▀ ▄▄▄▄▄ ▀███ ▄ ██▀█▀ █ ██▄▄█ ▄█<br>
▄▀ ▄█▀▄▄ █▄ ██ ██▄▄▀ ▄▀▄▄▄█▄▀ █ <br> ▄▄▄▄▄▄▄ ▀▄▀ ▀▄▀▀▀▀ ███ ▄█ ▄ █▄█ ▀<br> █ ▄▄▄ █ █▄ ▀▀ █▄▄█▄██▄▄▄█▄█ ▀<br> █ ███ █ █ ▀▀▀ ▄█ ▀▀▄█▀▄▀▄ ▄█ <br> █▄▄▄▄▄█ █▀▄▄▀ █▀▀██▄▀▄▄█▀▄▀ ▄ ▀<br></font></span></td><td>Success is a tasty spirit distilled from bitter failure<br>
- Corey Sean McGuire</td></tr></tbody></table></div><br>