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Thread: Static Electricity in MP3 Boxes

  1. #1
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    Post Static Electricity in MP3 Boxes

    What recommendations can anyone make about designing a box for your car mp3 player. I just built a box out of peg board that should be large enough to house all my hardware. I haven't yet started installing any of the parts tho.

    I'm curious if anyone has had any problems frying devices or anything. I figure this thing is going to be in the back of my SUV for some time being until I make everything look nice and it will be sliding around on the carpet. Since it's pegboard it should get some good cooling I'd assume, but **** can get in there as well, so I don't know if that is an issue.

    For the mother board, should I mount it on top of a sheet of metal? do I need to line the box with metal at all?

    For my HDD, I'm mounting it vertically and mounting it with springs on all sides to give it a lil movement. Should I wrap the drive in the foam that they pack HDD's in? just as added support?

    Basically any info would be a big help right now. I don't wanna go installing this thing and frying all my ****.

    -Tim

  2. #2
    Retired Admin Aaron Cake's Avatar
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    Cool

    Don't suspend your HD with springs. The oscillation induced by the springs will be much worse than that natural shocks created by the car...

    As far as static, don't worry about it. People put way too much thought into static electricity and computers. I have never seen a computer component fried by static electricity.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  3. #3
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    agreed with both of Aarons points, and in addition, stick to the peg board, dont worry about the sheet metal. Wood has a nice advantage that it doesnt conduct electricity!

    and insulation from car electricial noise is never really an issue with such a setup.... well in my experences anyway...
    Project - GAME OVER :(

  4. #4
    Maximum Bitrate
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    Hey Aaron, care to explain the two NICs I have sitting on my desk that are fried, but worked about a month ago? They sat in a box for about a month, and quit working.
    Clarion 200watt head unit w/ Aux in.
    Kicker 800watt 4 channel amp
    In a 96 Grand Prix SE.

  5. #5
    Retired Admin Aaron Cake's Avatar
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    Cool

    Cheap cards? I don't know...factory defects, cracked boards, bent components or static discharge (although the possibility of static damage is very remote).
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  6. #6
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    I walked up to my computer one day, touched the keyboard, and got static zapped. The computer turned off, and when I powered it back up, everything worked except the keyboard. about 10 keys or so worked. This was "back in the day". The system was a 286, and I think it was one of those older 84 key keyboards.

  7. #7
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    They were 3C509 cards, and had worked for years. One quit (was zapped) and one still works.
    Clarion 200watt head unit w/ Aux in.
    Kicker 800watt 4 channel amp
    In a 96 Grand Prix SE.

  8. #8
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    Originally posted by Aaron Cake:
    <STRONG>Don't suspend your HD with springs. The oscillation induced by the springs will be much worse than that natural shocks created by the car...
    </STRONG>
    Can't agree with you.My HD is suspended with 4 springs with no problems for 1.5 year,and also I did it for 5 more systems similar to mine,no problems more than 1 year - and roads here are at VERY bad condition...
    Can you explain how oscillation can damage HD? As far as I know,shock is what damage your HD,and shock is a strong force for a small period of time.
    The spring is absorbing the energy from bumping (more springs - less energy for every spring) and don't let the HD absorb it,and then that energy is converted to heat because of resistance of the spring.
    Enjoint life!

  9. #9
    Variable Bitrate Mikesz's Avatar
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    Springs do absorb energy. That also means they can store energy. From what I understand at certain frequencies the springs bouncing the HD up and down with that stored energy can actually be more severe than the bumps you are trying to absorb.
    91 cadillac sedan deville, winXP, FV25 with Celeron 800, Redant 7" widescreen in dash, Opus DC-DC, Irman, Digital Cable remote(lots of buttons), 120 gig 7200rpm 8meg cache WD hard drive, VI power mobile HD rack, mediaengine

  10. #10
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    If you are going to use springs you also need to use some foam or another form of shock absorber to act as a damper. It works the same way as your car if you remove the shocks it will be a bouncy ride.

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