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Thread: Thoughts on an ITPS Override Switch

  1. #11
    FLAC
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    Here's a simplified drawing of the single pole 3-throw switch configuration.
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    MikeH

  2. #12
    Variable Bitrate wkolodny's Avatar
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    That looks good MikeH. Only question I have is why would you wire the thrid connector to ground? Shouldn't it just be left open?
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  3. #13
    Constant Bitrate STI_FFY's Avatar
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    Quote Originally Posted by MikeH
    Here's a simplified drawing of the single pole 3-throw switch configuration.

    The center terminal of the switch is connected only to the ACC input of the ITPS. One of the outside terminals is connected to the car's ignition "on" (or ACC) point. The other outside terminal goes to 12V.

    When the switch is in the middle position, the center terminal goes to neither the ignition nor the ACC, so the ITPS does not run. In the other two positions, the center terminal is connected either to the ignition or the +12V depending which way you flip it. It is not necessary to ground the ITPS ACC input in order to switch the ITPS off, all you need do is open the circuit.
    SeeYa! -Jim-

  4. #14
    Constant Bitrate STI_FFY's Avatar
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    Quote Originally Posted by STI_FFY
    The center terminal of the switch is connected only to the ACC input of the ITPS. One of the outside terminals is connected to the car's ignition "on" (or ACC) point. The other outside terminal goes to 12V.

    When the switch is in the middle position, the center terminal goes to neither the ignition nor the ACC, so the ITPS does not run. In the other two positions, the center terminal is connected either to the ignition or the +12V depending which way you flip it. It is not necessary to ground the ITPS ACC input in order to switch the ITPS off, all you need do is open the circuit.
    Oh, and the switches I posted links for are SPDT w/center-off (not SP3T).
    SeeYa! -Jim-

  5. #15
    FLAC mauri's Avatar
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    Hi,
    this and' the scheme of as I have connected me my carputer.
    And' also a circuit antibump for the boxes connected to the audio amplifier.
    In this way they are connected after once setting with V1, and so' they are eliminated the bumps that I had in lighting and turning off of the carputer on the boxes audio.
    Made a will and work correctly
    Excuse me, the text in the scheme and' in Italian, I live in Italy
    Mauri
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  6. #16
    FLAC
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    Stiffy...you're absolutely correct. You really don't need to run the "off" position to ground. I just do this on my PSU to make sure the input isn't floating to some unknown voltage that could cause false triggers. I'm not sure what the input to the Opus circuit is so I can't comment on theirs.

    I've attached a new drawing that should illustrate your technique.
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    MikeH

  7. #17
    Variable Bitrate wkolodny's Avatar
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    Quote Originally Posted by MikeH
    Stiffy...you're absolutely correct. You really don't need to run the "off" position to ground. I just do this on my PSU to make sure the input isn't floating to some unknown voltage that could cause false triggers. I'm not sure what the input to the Opus circuit is so I can't comment on theirs.

    I've attached a new drawing that should illustrate your technique.
    That looks cool and it got me thinking. If I forgot it was in the always on position there is a chance that the pc/screen would run my battery down. How hard would it be to throw in an LED indicating when the ITPS was set to OVERRIDE Mode? What would that ckt look like?
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  8. #18
    FLAC
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    Well, absolute easiest circuit is one that just shows that there's +12v feeding your ITPS. It doesn't say you're in "always on", but it does remind you that there's +12v feeding the ITPS. It looks like this:
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    MikeH

  9. #19
    Variable Bitrate wkolodny's Avatar
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    Quote Originally Posted by MikeH
    Well, absolute easiest circuit is one that just shows that there's +12v feeding your ITPS. It doesn't say you're in "always on", but it does remind you that there's +12v feeding the ITPS. It looks like this:
    Hmm. Well that really doesnt work cause I dont really need an LED to show me that its on. I have the screen itself. I just want to know when the override mode is on.

    Would something like this work and and if so what kind of switch would SW1 be?
    Don't Fear The Gurkey
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  10. #20
    Constant Bitrate STI_FFY's Avatar
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    Quote Originally Posted by wkolodny
    Hmm. Well that really doesnt work cause I dont really need an LED to show me that its on. I have the screen itself. I just want to know when the override mode is on.

    Would something like this work and and if so what kind of switch would SW1 be?
    DPDT W/center-off. The three examples I gave are precisely this type, You just would not have used the second gang in the previous example (now you will use it).
    SeeYa! -Jim-

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