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Thread: Need help with a bypass switch.

  1. #1
    FLAC
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    Need help with a bypass switch.

    I have an opus power supply. If you are unfamiliar with the opus it has a line from the battery for power, and a line from the accessory to tell the power supply to turn on.

    I want to make a bypass switch so I can select between the accessory and the battery for the "on" signal. This way I can use the computer with the car off.

    I think I'm confusing myself and thinking too hard here, give me a little help

    Code:
    to battery  <---|      |
                    |switch|--> to power supply
    to accesory <---|      |
    Thanks!
    aka Kumaneko
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  2. #2
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    I can never remember which kind of switch is called what, (spst/spdt/dpst/dtdp), but you need one that has one central connection and switches the between the two outside connections. I think its dpst (double pole single throw).

    if you want to have an led with it, get a double pole double throw.

    i dont have an opus, but im assuming that the line is only a sensor, so it wont be drawing very much current, so you can just use any little switch from radio shack.
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  3. #3
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    Use a single pole double throw center off switch.

    You could use a double pole double throw center off and just not use one side of the switch sides.

    That way in the center position, it will always stay off.

    Radio Shack Part # 275-664 will work.
    http://www.radioshack.com/product.as...5Fid=275%2D664

    -Mario

  4. #4
    "Speaker of the Truth" veedubya's Avatar
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    Does this make sense

    #1. I dont have an Opus, But i looked on site and got an idea

    This maybe totally off base and wrong if so forgive me.



    The IGN line should only get voltage when car is cranked, so the "key" is the switch.
    Why not drop a SPST switch in parallel with the IGN line. That way if car isnt running you can force 12V from battery.

    I have done similar before and it worked for me.

    #2. This may not work and it may fry something. I dont know!

    Hope it helps,
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  5. #5
    FLAC cproaudio's Avatar
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    Re: Need help with a bypass switch.

    Originally posted by ShinkunoNamida
    Code:
    to battery  <---|      |
                    |switch|--> to power supply
    to accesory <---|      |
    Thats the right way if you're using the switch to turn on only the computer with out the key. If you want to use the same switch to turn on the stereo too to listen to MP3, you have diode and isolate the acc line or else it would back feed to the rest of the electrical system and turn on other accessories that dont need to turn on and quickly drain the battery. I have the same setup as the diagram above. for my switch, The top position, it turns on the computer and the stereo with out the key. The center position, the radio is turn on by the key but the computer stays off. the bottom position, both the computer and stereo are turned on by the key. At the center and bottom position, I can also use my alarm to remote turn on the computer. I had to use 3 relays and a few diodes.

    Originally posted by veedubya

    The IGN line should only get voltage when car is cranked, so the "key" is the switch.
    Why not drop a SPST switch in parallel with the IGN line. That way if car isnt running you can force 12V from battery.
    You don't want to energize just the IGN line because it would also turn on all the electrical that ties to that line.

  6. #6
    FLAC
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    cproaudio:
    that sounds a lot like what I want to do, think you could draw me up a diagram?
    aka Kumaneko
    "Don't make me moderate your ***!"
    Maxima of Doom - project thread - photo gallery
    mp3car system is currently FUBAR and finances do not allow for a correction of that situation
    Real computer hackers use a rotary cutting tool on their motherboard.

  7. #7
    FLAC cproaudio's Avatar
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    The On position, I set it so that it turns on the computer and the radio. After all, how are you gonna listen to the MP3's? (besides those people who use the computer as head unit)

    The off position, I set it so that it only turns off the computer because the radio is a part of the stock electrical system. There may be times when you dont want to turn on the computer for a short trip to the AM/PM around the corner. The radio has an off button, use it.

    The Acc (default) position, both radio and computer turns on with the key.

    For alarm remote turn the computer, the latched output is the simplest way. The problem is once it's remote turned on, it has to be remote turn off. This can be a problem for those who are forgetful like myself. I recommend remote power up the computer only as your stereo doesnt really need to boot unless you have the Kenwood KVT910DVD, 911DVD or the 915DVD. My personal setup is after I remote turn on the computer, turning the key to ACC resets the remote turn on, This means I dont have to worry about forgeting to remote turn off the computer. The ACC does it for me. The remote power on works in both off mode or acc mode. I hope this helps.

  8. #8
    Jay
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    Shink,
    I'm going to stage a couple of devices on startup and shutdown. I don't plan on having a head so I want things to happen in a certain order and time. When the car is started I want the computer to start (opus) but I don't want the screen (Xenarc) to click on until it has the xp startup logo (delayed startup). Then after windows is loaded and the mp3 is play (from hibernation) I want the amps to fire up (about 35 secs). I'm doing this with a PIC. I know your local so if you want I could help you out with something like this. My cuz has the PIC programmer. Hopfully at the next local meet I'll have everything done (hopfully).

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