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Thread: Linux help needed - make fun of the N00b

  1. #101
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    The P5V is perfect for this. It is effectively a linear regulator with some noise filtering and a soft on/off sense. It runs about $25.

    Fortunately, I have one of these on hand.

    I think when I mod mine, I'll include an SPDT switch on a separate input for the accessory line and green wire. That way, you can either have it always on, boot up each time the car starts, or just keep it off if you want.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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  2. #102
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    Thanks. Yeah I think it's time to give the mp3car store some luvin

  3. #103
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    Quote Originally Posted by cgalpin View Post
    BTW, What was the temp of the sheva before the mod? You initially said it would run cooler, but it sounds like the P5V is actually running hotter. The Carnetix site suggests a heat sink if you have over 1amp draw.
    The temp of the Sheeva overall feels cooler, but if you touch that screw then it is hot. The 5 volt draw is under .8 amps. Since this is going in the trunk of a car, and there are almost no cooling features in the plug, I think I'm going to stick a couple of fans in it.

    Quote Originally Posted by cgalpin View Post
    I'd like to do something similar, but keep the existing 120v back the way it is, source a power connector (and maybe another rear half of the case/shell if available), and make a separate power source for the car so I can swap it back and forth without effort.
    If you do that, you'll be spending more money than you need to.
    Once you mod it, you can get one of these guys for 6 bucks for when you want to power it inside the house. Personally, I'm just using a desktop power supply hooked up to it. If you wanted to get fancy, you could even pick up a couple of barrel connectors and stick a female on the plug, a male on the 12 volt supply in the house and another male in the car, for extremely quick switching from car to house.

    Quote Originally Posted by cgalpin View Post
    I am not very familiar with the power converters available - what other products out there are suitable (ie regulated) to power this plus multilple other 5 - 12v devices?
    The MP3car store has two 12 volt to 5 volt regulatores. One from opus and one from Carnetix. The opus is 10 bucks more expensive but probably does run cooler overall.
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  4. #104
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    Quote Originally Posted by PaulF View Post
    The temp of the Sheeva overall feels cooler, but if you touch that screw then it is hot. The 5 volt draw is under .8 amps. Since this is going in the trunk of a car, and there are almost no cooling features in the plug, I think I'm going to stick a couple of fans in it.
    If you have a heat sink lying around, please try it. Running cool is important, and I really think this can happen without adding fans which are just more things to go wrong.

    charles

  5. #105
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    Heat sink < power than fans. If you're only pulling .8 amps, a heat sink should do okay.

    Theoretically, you can do this super cheap with a 5 volt regulator from Radio Shack for $1.59 and heat sink for $1.49.

    It's rated to 1 amp. If you need more juice, you can use two in parallel. Not the most elegant solution, but it should suffice.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  6. #106
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    I fully recognize that a heat sink will do just fine in a house, problem is when in my car this thing is going to be sitting in a trunk that may be 120 degrees to begin with.

    That said, I just ordered a few tiny heat sinks. The exact ones that Carnetix recommended. I'll see what they do to temperature. For the price, they're worth testing before going the fan route.
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  7. #107
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    In an enclosed and high temperature space, fans can only help to the extent that the heat sink is warmer than the surrounding air. With a big PC installation, the heat from the processor will warm the trunk in a feedback loop, raising the temperature.

    I don't think this necessarily applies to the Sheeva unit. You're probably right that a fan will bring the temp down faster than a heatsink would. It's just that there's only a *little* heat to dissipate so the sink may work.

    Even if it doesn't, you'll need the sink to blow air from the fan over, so it's all good.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  8. #108
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    Well part of the reason for the fan is also because the sheeva is basically an oven. It has only tiny little slits for air to pass through. I think in the car, I'm just going to take it out of its case so the heat has somewhere to go. Right now I've been running the sheeva off of 12 volts for a few hours and the regulator is outside of the sheeva. It is significantly cooler. I don't have an exact number, but I can at least touch it without burning myself. I'll try to get a temperature later.
    My Nearly Complete Car:
    http://www.mp3car.com/vbulletin/show...ed-car-pc.html

    Micro Control Center... Control Your Car Across the Internet
    http://www.mp3car.com/fusion-brain/1...-internet.html

    Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
    http://paulfurtado.com/

  9. #109
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    And another reason to remove the ear cover/power supply completely when using it in the car methinks!

  10. #110
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    Quote Originally Posted by PaulF View Post
    Well part of the reason for the fan is also because the sheeva is basically an oven. It has only tiny little slits for air to pass through. I think in the car, I'm just going to take it out of its case so the heat has somewhere to go. Right now I've been running the sheeva off of 12 volts for a few hours and the regulator is outside of the sheeva. It is significantly cooler. I don't have an exact number, but I can at least touch it without burning myself. I'll try to get a temperature later.
    Good point. I may keep the case but drill more cooling holes in it.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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