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Thread: Electrical questions

  1. #17

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    Ok, thanks! Can you please post the info on how to "trick" the power supply? Thanks!! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/alien.gif[/img]
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  2. #18

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    Score!!!!


    20 bucks

    linkage: http://www.newegg.com/app....order=1

    Fortron ATX350GU 350W HiQ Brand P4/AMD Ready Power Supply - OEM
    Specifications:
    HiQ 350W ATX12V, W/ Noise Killer, P4/AMD compatible, Input
    range 115/230VAC
    100% Hi-pot & ATE tested; Approved by UL, CSA and CB
    Power Supply Type: ATX12V
    Fan(s): Internal 12VDC Sleeve Bearing fan Model#: ATX350GU -OEM Special FedEx Saver Shipping $6.00

  3. #19

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    lithops, don't hook burnt peltier to the power supply, that peltier is toast and not recoverable, if connected to a power supply you may damage the powersupply. Peltiers are fairly delicate and have very specific voltage ratings from 5V to 20V or more. You need to find out exactly what the voltage rating is on your peltier chip before hooking it up to any power supply. If your chips are only 10V and you hook them to a 12V computer PS then it will be fried. They also use a large amount of current so make sure you get a good power supply.

    Joe
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  4. #20

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    Joseph,

    Could you explain more in detail please? I have used numerous pelts in my time, and I have always wired them straight to my 12V rail. Now, I ALWAYS use a good psu, (backround check, a bad psu maker will rate his watage while runnin tests in a freezer, a good psu maker will rate his wattage in real world conditions)

    But honestly, I have never had to put a resistor or a POT in between my 12V rail and my pelt.


    Casper

  5. #21

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    Casper, you can't just add a resistor, the resistor would never take that much energy dissipation. And a POT would probobly go out in a blaze of glory.

    Peltiers come in many shapes, sizes, and power ratings. Including different voltages. I will admit that you can often hook them to a 12V rail without out a problem. Why?, because many of the ones that are available on the user market were purchased by suppliers that intended to sell them individually to the average user who would most likely use a 12V source such as mounting it onto a CPU. However if the chips are bought from an actually electronics parts supplier (not talking about radio shak or Jameco) then they could be for any voltage. I some cases the design may require that the chip run off five volts with much higher current, or a much higher voltage with lower current. If you check out a web site of a peltier manufacture you'll get a good idea of what is really available.

    Of course I have no idea where lithopsman got his chips, in all likelyhood they are 12V, but it is better to be sure.

    Joe
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  6. #22

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    Ok, now I'm really confused, and this is starting to cost WAY too much, especially if I have to replace the burnt peltier cell! I am a little bit dissappointed now, and I'm really open to suggestions on how to make do with what I have, and maybe a power supply. I'd like to not have to buy a new pelt, also, the pelts came with ZERO info in the package, not even an invoice... Thanks again!! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/alien.gif[/img]
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  7. #23

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    Sorry lithopsman, that chip is toast. The chips are made of lots of very small bimetal connections. Too much current kills them, and yours is very killed. Unfortuanately I can't imagine a single chip cooling a ten gallon tank. For that matter I can't imagine two chips cooling a ten gallon tank unless you wrap it in insulation.

    If you really want to use this method, buy a large cooler with built in peltier cooling and add lights to it. Or better yet, a small dorm fridge would be way better. You just aren't going to get the results your looking for in comparison to the trouble you are going through.

    Sorry I can't provide a ray of hope. On the other hand if you continue on current track you will learn a lot of valueble information.


    Joe
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  8. #24

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    Sorry that you doubt me, I have had lots of people say that it is possible, though, because the peltier cell will be attatched to a heatsink/fan and coldsink/fan, and it will blow into the ultra-highland area of the 50 gal. long tank, the other side is for the plants that are a bit less ultrahighland (ie: N. x 'Judith Finn', N. ventricosa, N. maxima, etc.) Thanks Casper for all of your support! Also, the two heatsink fans have 3 wires with a little female hook-up thingy ma watsit (with 3 inputs at the end) and the pelt is just 2 raw wires. Will these work on the same power suppy without lots of equipment? THANKS AGAIN!! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] [img]http://www.**********.com/iB_html/non-cgi/emoticons/alien.gif[/img]
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