TPA 3116 vs the tripaths

Discussion in 'New Gear - Values' started by Poultrygeist, Feb 11, 2014.

  1. hifix

    hifix Active Member

    Messages:
    221
    Location:
    Trial Mountain
    Thanks for that Jhoyt,

    In my rig (without an active pre / buffer), i've needed around 4400uF (@ 23v) close to the board for it to sound decent. Things were sounding abit thin otherwise. I'm in a similar boat with 8 ohm 86 db speakers.
     
  2. drew_t

    drew_t Well-Known Member

    Messages:
    614
    IMG_20171205_103527.jpg
    Here's one of my recent projects. It's a 2.1 board which had horrendous power on/power off pop, as described in this Youtube review:

    .

    A guy in Japan came up with a circuit to fix the pop, and did a bunch of other stuff: http://park8.wakwak.com/~hilo/audio/tpa3116d2_amp3ch/index.html .

    I built the circuit (two diodes, two resistors, two capacitors, and a transistor) on a small scrap of vero board. Not exactly the most elegant implementation, but it works really well. The only other modification I carried out was the removal of the one capacitor which the guy indicated was preventing the subwoofer channel snyc from operating correctly.
     
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  3. bubba42

    bubba42 Active Member

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    233
    Wow, I got the surface mount resistors to do the gain mod. They are TINY! Anyone have advice on that precise of soldering? I am not sure if I'll be able to do it.
     
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  4. bigx5murf

    bigx5murf Well-Known Member

    Messages:
    826
    Location:
    Las Vegas
    Now you can see why I melted some nearby components LOL. Anyway, the key to removing the old ones, solder some extra solder to both sides so they retain heat a bit longer. Then heat up both sides, and flick them off with the tip.

    Then add a bit more solder to both pads. I borrowed this from my wife so I can hold and manipulate the resistor as I soldered one side.
    [​IMG]

    Then the other side is easy.
     
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  5. Poultrygeist

    Poultrygeist Addicted Member

    You guys have better eyes and dexterity than me. I've been working on two of these TPA3118 mono boards on and off for a couple of months but still have soldering to do.

    Ridiculously small but I guess it saves on shipping from China.

    [​IMG]
     
  6. nj pheonix

    nj pheonix AK Subscriber Subscriber

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    Location:
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    There are guys in the city (NY) that writes your name on a grain of rice. :rolleyes:
    Maybe we can hire them out?
     
    Last edited: Dec 7, 2017
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  7. bubba42

    bubba42 Active Member

    Messages:
    233
    I mod watches, so I have a cheap mangifying glasses/visor from harbor freight. I think that will help. I've taken of a surface mount resistor before, but never soldered one on. I'll give it a try someday when the coffee has worn off. I'm planning on doing my dual-chip, because right now it is pretty much too high gain for high efficiency speakers.

    Now that we know that the resistors in the Breeze do not match up with the data sheets, I wonder what gain we're starting with. Also, I wonder if it would work (and if so what gain it would have) if both resistors were removed instead of one removed and one replaced.
     
  8. nj pheonix

    nj pheonix AK Subscriber Subscriber

    Messages:
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    Location:
    New Jersey
    I don't think I've ever heard anybody say that before (to be fair I lead a sheltered life:dunno:)

    What does that mean?
    Repair?
     
  9. bubba42

    bubba42 Active Member

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    233
    It isn't that different from this group that hacks together amps from all kinds of parts. Perhaps some of you might be interested! :)

    One finds a decent base watch, then modifies it. One that is popular is an Invicta which comes with a good Seiko automatic movement, a solid stainless case, and has readily available replacement dials, hands, crystals, straps, etc.. If you glance through this article, you can see one modder's process. In the end you get a watch that is uniquely yours.
     
  10. bigx5murf

    bigx5murf Well-Known Member

    Messages:
    826
    Location:
    Las Vegas
    I have a few seiko monsters with upgraded sapphire crystals myself. I pay a watch repair guy to swap my crystals and regulate my movements though.
     
  11. bigx5murf

    bigx5murf Well-Known Member

    Messages:
    826
    Location:
    Las Vegas
    I picked up a 14amp pyramid power supply today for $10. Can't wait to get home and try it out.
     
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  12. jhoyt

    jhoyt Incomprehensible space llama

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    New? Used?
     
  13. trikster

    trikster Well-Known Member

    Messages:
    604
    More than likely used.
     
  14. bigx5murf

    bigx5murf Well-Known Member

    Messages:
    826
    Location:
    Las Vegas
    Used, and it popped the fuse after 2 hours lol

    back to the ps-8kx until I get a chance to hit home depot tomorrow
     
  15. trikster

    trikster Well-Known Member

    Messages:
    604
    Pull the cover off and look at the caps. Might have one failing. Or could be dust build up.
     
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  16. jhoyt

    jhoyt Incomprehensible space llama

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    That's only $5/hour.
     
  17. bubba42

    bubba42 Active Member

    Messages:
    233
    I finally did this mod to my dual chip. It was not easy, as the surface mount resistors are TINY!!! I did it though and it is working. Previously even with the volume off there was quite a bit of music coming out. Now I can hear it with my ear next to the speaker, but it is much much less. I also have more usable range on the volume knob.

    I am not sure if it improved the sound or not, it is near impossible to do a direct comparison.



     
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  18. hifix

    hifix Active Member

    Messages:
    221
    Location:
    Trial Mountain
    Hmm.. ok i'll join the party.
    I have been running the board (YJ BB) at 32db gain. When i free up some time, I'll build another with the stock gain (26db). I'd be keen to hear if the sound quality is better with lower gain.
     
  19. drew_t

    drew_t Well-Known Member

    Messages:
    614
    Another recent project: Texas Instruments evaluation module board with TPA3255 chip ($75 from the TI online store with a discount code) and a Mean Well 48 volt power supply, in an old Antec Aria computer case. 315 watts per channel in 2.0 mode.
    evm3255-1.jpg evm3255-2.jpg evm3255-3.jpg
     
  20. jhoyt

    jhoyt Incomprehensible space llama

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    Drew, what are your impressions of the 3255 amp?
     

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