Home of the Squeezebox™ & Transporter® network music players.
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  1. #11
    Quote Originally Posted by JohnSwenson View Post
    The S/PDIF output circuit is actually quite good, much better than what is in the SB3.
    I can confirm this. On a scope, with 75 ohm cable and termination, the signal looks just great, I haven't seen any better yet. The transitions nicely fall together, an ideal eye pattern. Very promising.

    Back on the subject, are there somewhere any pictures online yet, what the Touch looks like, inside?

    I'd be interested in shorting the analog output capacitors.

    J÷rg

  2. #12
    Junior Member
    Join Date
    May 2010
    Posts
    9
    i finally managed to dismantle it. the flexi pcb cable did give me some problems until i could locate the latch.

    then as i unscrewed the screws, i didn't know i missed one. it's hidden underneath some soft damping material. damn!

    ok. the bad news. the touch is a thousand times unlike the sb3. if you look at the sb3, you could trace the spdif output to the ttl ic driving it. you could trace the dac. you could tell which is which, what is what.

    on the touch, everything is much much smaller! chip packages are bga, qfn, tssop... very very tiny, very very small.

    i could identify the dac as akm4420. headphone chip ts486. couldn't locate what's driving the spdif output though. i don't care much about the internal dac, headphone amp, nor toslink. i only want i2s or find a better way to tap out spdif.

    i2s can be tapped from input of akm4420 but you still need to do your homework. all the components around it are so tiny. believe me, a 0805 resistor dwarfs over all the passive components here!

    i could also see a wolfson wm8974 chip. since this chip has so many features, not sure what it's function here.

    as much as i want to remove the spdif rca and replace with a bnc, and put in a pulse transformer for spdif, the lack of space is really an issue here. there simply isn't much!

    i get home late every day so it's too dark to take photos. i'll take photos if i get home early.

    yeo

  3. #13
    Junior Member
    Join Date
    May 2010
    Posts
    9
    i took photos of the pcb. you could view from my blog post here.

    http://diyparadise.com/blogs/2010/05...eezebox-touch/

    thx!

    yeo

  4. #14
    Junior Member
    Join Date
    May 2010
    Posts
    9

    how to open up the squeezebox touch?

    i took photos of the pcb. you could view from my blog post here.

    http://diyparadise.com/blogs/2010/05...eezebox-touch/

    thx!

    yeo


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  5. #15
    Thanks for the photos. I'm beginning to think the best approach to bringing out I2S signals is to move the circuit board to a new box. This would probably mean abandoning the display. I wonder whether the board can function without the display attached.

    Since you have the board detached from the display, maybe you could connect power and see if it will still play music?

    Jack

  6. #16

    how to open up the squeezebox touch?

    Thanks for the photos. I'm beginning to think the best approach to
    bringing out I2S signals is to move the circuit board to a new box.
    This would probably mean abandoning the display. I wonder whether the
    board can function without the display attached.

    Since you have the board detached from the display, maybe you could
    connect power and see if it will still play music?

    Jack


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  7. #17
    Junior Member
    Join Date
    May 2010
    Posts
    9
    i've assembled everything back together. i didnt' get a good connection on the flex cable so the display lighted up but doesn't display any characters. it did interface with the remote control (the unit beeps) but as i can't see what it's doing, you can't tell what's going on.

    for spdif mod, an external tweak is the easiest way to go.

    yeo

  8. #18
    Junior Member
    Join Date
    May 2010
    Posts
    9

    how to open up the squeezebox touch?

    i've assembled everything back together. i didnt' get a good connection
    on the flex cable so the display lighted up but doesn't display any
    characters. it did interface with the remote control (the unit beeps)
    but as i can't see what it's doing, you can't tell what's going on.

    for spdif mod, an external tweak is the easiest way to go.

    yeo


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  9. #19
    OUCH!

    Can you still access and control the Touch from Squeezebox Server Web interface? At least this way you can figure out what is going on until you can get the cable set.

  10. #20
    yeo, I hope you were able to get the Touch with its display and controller working again. I have not yet had the time (or nerve) to open mine up.

    Jack

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