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Thread: Selectable Power

  1. #1
    Newbie
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    Mar 2001
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    Regina, SK. Canada
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    Lightbulb Selectable Power

    Hey guys. Here's something I'm working on for my project. Since I may want to show off the system while sitting in the driveway or something like that, instead of having the car sit there and run why not hook the computer up to a extension cord and plug it into the house? So I went and got a SPDT switch from Radio Shack. I'm going to cut the positive outputs from the inverter and the extension cord and hook them up to the switch and then have the switch output go to the power supply.

    Now comes the questions. The switch is rated at 6A at 125V AC, will this be able to handle the computer supply? Since there's only 3 single connectors on the switch, where do the negative and ground cables get routed? Can I just connect them straight up to each other? Also, the connectors on the switch are pretty small. How do I connect the fairly large power cables up to it? Are there little spade connector things I can get that clip on?

    Thanks for all the info!

    P.S. Make sure you read my post about LCD controllers. I'm still trying to work out a good way to hook up my LCD.

    ------------------
    AMD Duron 750, 128m RAM, 10gig WD, 12.1" TFT screen, SB Live! 5.1, custom plexiglass case
    TalonTemple.com
    AMD Duron 750, 128m RAM, 10gig WD, 12.1" TFT screen, SB Live! 5.1, custom plexiglass case
    TalonTemple.com

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

    Why not just connect the computer straight to +12V with just a switch??

    A SPDT switch will not work. You need a DPDT switch.

    ------------------
    Aaron Cake
    London, Ontario, Canada

    Player: Cyrix 200, 32MB RAM, 10.2Gig Quantum HD, Onboard EtherNet/Sound/Video, Custom Lexan Case, Arise DC-DC, Win95 Kernal w/Custom Player
    Car: '86 Mazda RX-7 w/Basic Performance Upgrades
    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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    Regina, SK. Canada
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    What do mean, "connect it to 12 volts"? The only part of the computer that would see +12V would be one of the wires running from the power supply to the motherboard? How do I connect the two input wires to the power supply is what I'm asking.

    ------------------
    AMD Duron 750, 128m RAM, 10gig WD, 12.1" TFT screen, SB Live! 5.1, custom plexiglass case
    TalonTemple.com
    AMD Duron 750, 128m RAM, 10gig WD, 12.1" TFT screen, SB Live! 5.1, custom plexiglass case
    TalonTemple.com

  4. #4
    Maximum Bitrate gizmomkr's Avatar
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    Smyrna, Ga, USA
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    Post

    If it was my set up, here is what I would do -

    use a DPDT switch

    To PSU 12 V -| |- To Psu
    To Inverter -| |- To Inverter in
    To Car Bat -| |- To Car Bat
    + -

    Use a 10 Amp switch.... or whatever switch you want hooked to a dpdt relay, with the relay wired as shown above.

    Hope this diagram formats right
    Gizmo-
    Techonlogy on Wheels
    http://www.hjnetworks.com/car

  5. #5
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    How about unplugging the power cord from the inverter, and plugging it into the extension cord?

  6. #6
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    Not gonna happen. Power supply and inverter are going to be buried deep into the dash. The only part of this computer project that anyone will see is the screen, which will be folded up all stealth-like most of the time.

    ------------------
    AMD Duron 750, 128m RAM, 10gig WD, 12.1" TFT screen, SB Live! 5.1, custom plexiglass case
    TalonTemple.com
    AMD Duron 750, 128m RAM, 10gig WD, 12.1" TFT screen, SB Live! 5.1, custom plexiglass case
    TalonTemple.com

  7. #7
    Maximum Bitrate
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    Salt Lake City, UT, USA
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    Talking

    You could always make a spot under the hood where you can switch it from the externtion cord to the inverter. Then it would be out of sight and still accessible.
    1983 BMW 733i
    Cyrix 166 32MB with MPXPLAY And no display. Player sits on the back seat with a keypad in front. Someday I'll mount this thing for good...
    *****************************
    Gathering parts for carplayer v2.0!

  8. #8
    Retired Admin Aaron Cake's Avatar
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    Wink

    <font face="Verdana, Arial" size="2">Originally posted by dan0myte:
    What do mean, "connect it to 12 volts"? The only part of the computer that would see +12V would be one of the wires running from the power supply to the motherboard? How do I connect the two input wires to the power supply is what I'm asking.
    </font>
    Sorry. Even I don't remember what I was trying to say...

    ------------------
    Aaron Cake
    London, Ontario, Canada

    Player: Cyrix 200, 32MB RAM, 10.2Gig Quantum HD, Onboard EtherNet/Sound/Video, Custom Lexan Case, Arise DC-DC, Win95 Kernal w/Custom Player
    Car: '86 Mazda RX-7 w/Basic Performance Upgrades
    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."

  9. #9
    Newbie
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    Mar 2001
    Location
    Regina, SK. Canada
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    Post

    Haha, nice one Falcon but I lack the energy to get out of the car, pop the hood and yank out plugs every time I wanna run the computer at home. I just want to lazily hit a switch and that's it.

    ------------------
    AMD Duron 750, 128m RAM, 10gig WD, 12.1" TFT screen, SB Live! 5.1, custom plexiglass case
    TalonTemple.com
    AMD Duron 750, 128m RAM, 10gig WD, 12.1" TFT screen, SB Live! 5.1, custom plexiglass case
    TalonTemple.com

  10. #10
    Variable Bitrate
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    Jul 1999
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    Greensboro NC
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    Post

    Hey dan0myte check your mail I sent you a schematic of a little relay circuit that should do the job for you.

    Catlas

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