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[Q] Car stereo at home wiring.

Discussion in 'General Electronics Discussion' started by ramziukas, Nov 18, 2015.

  1. ramziukas

    ramziukas

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    Nov 18, 2015
    Hello i want to ask, how properly connect car stereo at home. I have pc PSU 12v 15amps and router power supply 12v 1amp. When i connect pc PSU directly to car stereo it works, but if turn off power car stereo loose presets and memory. Can i connect router power supply at the same time to keep memory while main Psu is turned off?
    maifdfn_view.jpg
     
  2. Martaine2005

    Martaine2005

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    May 12, 2015
    Hello,
    What car stereo is it? Model?
    The memory may have a 5v rail. So the constant 5v on the psu could be used. And the 12v still be turned off by it's own switch.

    Martin
     
  3. ramziukas

    ramziukas

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    Nov 18, 2015
    Model is: panasonic cq-c1415n
    I want turn off pc psu before night, because cooler makes noises.
     
  4. Martaine2005

    Martaine2005

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    May 12, 2015
    Yes, I understand why you want it off.

    Does your psu have a constant 5v?
     
  5. ramziukas

    ramziukas

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    Nov 18, 2015
    Pc psu have 5v, 12v and 3,3v, but if turn off no voltages left. Other router psu is only 12v dc. Also found repair manual for CQ-C1465N but i believe its same pcb layout as my stereo. ;) http://www.filedropper.com/panasoniccq-c1465n
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009
    you need a permanent 12V connection
    12V comes into the unit via 2 cables ACC ( accessories switch) on the car ignition and direct from the battery
    The direct from the battery supplies the main "grunt" current for the stereo's amplifier and also keeps the memories
    The 12V via the ACC supplies the power to switch the stereo between running and standby


    Dave
     
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  7. Martaine2005

    Martaine2005

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    AH well, if your psu has not got a constant 5v supply, then my idea wont work.
    It may be safer to get another psu that has a constant 5v.

    Martin
     
  8. davenn

    davenn Moderator

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    read my last post, Martin
     
  9. Martaine2005

    Martaine2005

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    We posted together....I see it!!

    Martin
     
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  10. ramziukas

    ramziukas

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    Nov 18, 2015
    Thanks very much for your time and answering my question. To bad i dont want to use car battery at home. I always thought main all current goes via ACC cable. Maybe i can add small 16v 1000uf capacitor to keep stereo memory?
     
  11. Martaine2005

    Martaine2005

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    May 12, 2015
    My point was to keep the memory, not power the amp.
    The head unit can be turned off by the head units button! But constant power for memory is still there.
    So current used is minimal.

    Martin
     
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  12. davenn

    davenn Moderator

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    yes, I realise you wouldn't want to use a car battery in the house,
    the point is you need a second 12V supply
     
    ramziukas likes this.
  13. davenn

    davenn Moderator

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    no, cuz that goes via the ignition switch in the car which doesn't have the current carrying capacity for hi power loads
    That is why there is a MAIN connection direct to the battery for the heavy load

    No a 1000 uF cap wont do it
     
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  14. Martaine2005

    Martaine2005

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    May 12, 2015
    The simple solution then is.....o_O
    psu yellow to radio ACC,
    psu yellow with diode to constant 12v.
    Router adapter positive with diode to constant 12v.

    Turn on psu, Turn off router adaptor and turn radio on!!
    To power down, turn radio off, turn router adaptor on and turn psu off!!

    Martin
     
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  15. ramziukas

    ramziukas

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    Nov 18, 2015
    Can i connect like this? What type diodes use to hold 15A max current?
     

    Attached Files:

  16. Martaine2005

    Martaine2005

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    Pretty much like that.
    I doubt the stereo will draw more than 2 or 3 amps. So 5 amp diodes should be more than enough.
    Forget the 15 amps, that's the max the psu can supply.
    Just make sure the diodes are before your red circle joint.
    This also assumes no external amps are used.

    Although I know this will work as I have explained above, if you damge the stereo, don't come crying!!
    This is not the correct way of using a car stereo or ATX PSU.

    Martin
     
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  17. ramziukas

    ramziukas

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    Nov 18, 2015
    This is only reason why i try to connect Atx psu is i bought stereo for 8euros. :) I think to add this diode: 1.5KE15A
    Could you show in my picture where to add diode please?
     
  18. Martaine2005

    Martaine2005

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    ramziukas likes this.
  19. ramziukas

    ramziukas

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    Nov 18, 2015
  20. Martaine2005

    Martaine2005

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    I would think the uni-directional would be the one.
    If you're having trouble, buy a bridge rectifier and use that.

    Martin
     
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