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Thread: Power/ITPS Woes

  1. #1
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    Exclamation Power/ITPS Woes

    Two questions here:

    1) ITPS overheated.. My ITPS seemingly shut down and then came back on last night while I was sitting in my garage tweaking WinXP on my carputer... It was up for about 30 minutes, and all of the sudden my PC rebooted. I didn't know what happened so I ran to the trunk and sure enough it was rebooting.

    The ITPS is in a small black plastic case from Radio Shack. It's about 3"x3"x6" with about 12 1/4" holes I drilled in it to help it vent. The plastic case was damn hot (although not hot enough to melt it or the zip ties hold the ITPS board in place). But, I figure the ITPS got hot and overheated..

    SO, how do I do an even BETTER job at cooling my ITPS? Any cool ideas? I might just mount the sucker to my amp rack, no plastic casing at all, and hook up some cross-vent fans - those would help keep my amp cool too (although it runs cool anyways).


    2. When I had my amp on and my carputer off, and the RCAs plugged into the carputer and amp, I hear engine whine and some background white noise. It's almost as if the carputer is acting as a antenna since the RCAs are plugged in. Does this make any sense? It was unplugged completely at the time. The only wires were going to my USB hub (+5v, which was off because the PC was not supplying power to it), the Keyboard and VGA, which may run over some power wires in the door sill, and the RCAs...

    ????????

  2. #2
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    Quote Originally Posted by sq_geek
    Two questions here:

    1) ITPS overheated.. My ITPS seemingly shut down and then came back on last night while I was sitting in my garage tweaking WinXP on my carputer... It was up for about 30 minutes, and all of the sudden my PC rebooted. I didn't know what happened so I ran to the trunk and sure enough it was rebooting.

    The ITPS is in a small black plastic case from Radio Shack. It's about 3"x3"x6" with about 12 1/4" holes I drilled in it to help it vent. The plastic case was damn hot (although not hot enough to melt it or the zip ties hold the ITPS board in place). But, I figure the ITPS got hot and overheated..

    SO, how do I do an even BETTER job at cooling my ITPS? Any cool ideas? I might just mount the sucker to my amp rack, no plastic casing at all, and hook up some cross-vent fans - those would help keep my amp cool too (although it runs cool anyways).


    2. When I had my amp on and my carputer off, and the RCAs plugged into the carputer and amp, I hear engine whine and some background white noise. It's almost as if the carputer is acting as a antenna since the RCAs are plugged in. Does this make any sense? It was unplugged completely at the time. The only wires were going to my USB hub (+5v, which was off because the PC was not supplying power to it), the Keyboard and VGA, which may run over some power wires in the door sill, and the RCAs...

    ????????
    Sounds like you are using the same RadioShack Case I am using for my 12V power supply. I am using 4 boost/buck switching regulators that can create a lot of heat. I put fans on both ends of the housing, one sucks, one blows (no pun intended) like a windtunnel. The only problem was that it sounded like a windtunnel so I unpowered one of the fans and it works great. Just cut the holes on the ends of the case with a dremel and screw in the fan. A small fan from a CPU heatsink will do fine.
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  3. #3
    Variable Bitrate brooksware2000's Avatar
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    EBJUSTIN, is this power supply in your car if so what regulators did you use to build it?
    Check out my hopefully useful site...

    www.hobbybotics.com

    It's still under design but it is functional

  4. #4
    Clover Grayscale's Avatar
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    I think those are those texas instrument ones that you can get samples of...kind of expensive unless you get the samples
    CarPC install is starting to come along again...

  5. #5
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    Quote Originally Posted by brooksware2000
    EBJUSTIN, is this power supply in your car if so what regulators did you use to build it?
    Yes, the power supply is used in the car...it works great, it survives a crank and regulates 12V well with the car on or off. The regulators are TI PT5071. They are rated at 1.5A each so I have four in parallel with the outputs isolated by schottkey diodes.

  6. #6
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    Yeah I need to hook up some fans to the ITPS to keep it cool. Can I run 2 little PC fans (3" or so) off of the ITPS itself? Do I need to use any resistors? I know some of these fans if they get more than +5v, they start running super fast and can break/fly apart haha..

    I could just run them off my PC's +5v rail, but it is already supplying power to my USB hub, touchscreen, slimline DVD, laptop HDD, and soon to be USB XM Radio, and USB GPS receive.. *sigh*

  7. #7
    Variable Bitrate lawrence's Avatar
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    use standard 12v case fans( $6 at comp usa ) then use the power before the circut this will not add to the load on your shut down cotroler and will shut of with the car.

  8. #8
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    So off the ignition lead and the ground, or do you mean off the ITPS output + and -?

  9. #9
    Variable Bitrate lawrence's Avatar
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    battery
    +
    +
    +
    +
    igniton switch +++++++++++++ fan -----------ground
    +
    +
    +
    ++++++++++ itps ++++++++++++ pc

  10. #10
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    ok, thanks Lawrence.. you don't think the fans will suck up all of the juice and not leave any to turn on my ITPS and Amp?

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