trying to find inputs for this audio processor chip

Discussion in 'The Projects Forum' started by AFG34, Oct 20, 2010.

  1. AFG34

    Thread Starter New Member

    Oct 20, 2010
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    What I'm trying to do is add an auxiliary port to my car stereo.

    I got the idea on how to do it from this page: http://donn.dyndns.org/projects/carstereoinput/

    Basically it tells you to find the rightIN and leftIN on the audio processor and solder headphone cable there.

    I removed my stereo from my accord 2000' and here's what it looks like:
    http://img295.imageshack.us/img295/8166/img0357o.jpg
    ctrl + mouse wheel to resize image

    I think the audio processor is the on the bottom right corner with blue paint around it.

    The chip si made by alpine and the model number is "51T95037W02"

    I tried digging the internet with google but could not find a datasheet for that chip.

    So i don't know where on the pcb board to solder the cable to.

    Any ideas?


    btw, i posted this at a car forum and if you care to read it go here: http://www.redliners.ca/forums/showthread.php?t=48690
     
  2. marshallf3

    Well-Known Member

    Jul 26, 2010
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    You may or may not be able to do it depending on how integrated the preamp circuitry is.

    Best place to start would be to find a factory service manual.
     
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    It could be done.
    But in order to do tht I will need more closeups of the PCB.
    Numbers of the Amp chip.

    I might have to trace the PCB to find appropriate points for the line input
     
  4. AFG34

    Thread Starter New Member

    Oct 20, 2010
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    here's a 6 megapixel picture: http://img713.imageshack.us/img713/6646/cimg0127r.jpg

    If you can't read the writing on any of the chips, let me know.



    btw:
    on the above pic, bottom right corner is a creamy colored bus. That is where the cassette deck goes into.
    I tried hooking up the stereo to the car and tried touching the ends of headphone cable (while it was attatched to my phone playing a song, and tape was selected on the stereo) to the pins. I couldnt hear anything.

    Is there a way to hack into that?? because there are twenty pins on that bus and the cassette deck transmits audio through one/some of those so technically it should be possible right?
     
  5. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    When taking pictures, flash glare shud be avoided. Other wise it is pretty useless.

    What u are trying is possible. As I have done this almost every time. But for me to do it, I have to study the PCB and it's components. Since I don't have it, u have to provide me these things.

    like, good close ups, from which I can make out the PCB traces.
    I would need both sides.
    And u have to dismantle it more than tht if u want anything to be done.

    I need to know the Power amp IC no.s and it's PCB layout close ups
     
  6. AFG34

    Thread Starter New Member

    Oct 20, 2010
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  7. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    I think the best approach is to get your mp3 player, add a series resistor say 10kohm with the output, clip the cable ground to the chassis, turn radio on and start poking the resistor around to find the right place(s) where the signal could be injected. If you can´t find anything, try 1000 ohm, then 100 ohm, I wouldn´t go less than that.

    Or find datasheet for the vertical chip with white paste in the right top corner, find which pins are inputs and trace it from there.
     
  8. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    U are not really helping kubeek.
     
  9. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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  10. AFG34

    Thread Starter New Member

    Oct 20, 2010
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    tried photo-bucket but it was resizing it and also decreasing quality of picture

    so i just put both pictures in zip file
     
  11. AFG34

    Thread Starter New Member

    Oct 20, 2010
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    R!ff@@?? where did you go

    if these pictures are not good let me know
     
  12. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    It seems u have plenty of connections to this set.
    Can u show me the back connector and the harness

    Do u use anything else with ur stereo like a CD changer or something
     
  13. AFG34

    Thread Starter New Member

    Oct 20, 2010
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  14. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    This is going to be rather difficult.
    I will edit a picture and ask u, for the time being, tell me, do u wish to use the CD changer as well together with what ever tht u are going to add now.

    And what else will be in use.

    Or better yet, draw up a block diagram of all the components tht will be connected to the stereo.

    I am trying to make the connection as simple as possible. So I need all the info properly

    See the attached. Show me what connects to "?" Jack
     
    Last edited: Oct 24, 2010
  15. AFG34

    Thread Starter New Member

    Oct 20, 2010
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    I will use the aux port 99% of the time. However, radio would be a nice addition. I don't care about the cd changer.

    So just the aux port and radio ---> stereo

    the "?" is a cable from the car that goes into the stereo, here's a pic:
    http://img832.imageshack.us/img832/8315/img0361bg.jpg
    i think this is what connects the stereo to the speakers

    on the underside of the stereo, i found this interesting sticker:
    http://img253.imageshack.us/img253/448/img0362hg.jpg
     
  16. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Then you should just need to connect your input to the GND, Lch+ and Rch+ pins and switch the radio to cd changer input. But it is also possible that the radio will try to communicate with the change via the BUS pins and make it impossible to switch to the changer.
     
  17. AFG34

    Thread Starter New Member

    Oct 20, 2010
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    The first part of what you wrote makes sense, but can you elaborate what you mean in the bolded text
     
  18. davidwilsoon

    New Member

    Oct 24, 2010
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    The top image is not loading..try photo bucket for a change.

    From the looks of the second picture (underside) I think this wud be pretty easy in ur case


    ___________________
    watch movies online
     
  19. marshallf3

    Well-Known Member

    Jul 26, 2010
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    When you change a radio over to the CD function it may try and verify that a CD unit is actually connected.
     
  20. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    For example when I try to switch my radio to disc changer, it simply doesn't do it because there is none connected.
     
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