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Thread: Difference between these two TDA7850 amp

  1. #1
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    Difference between these two TDA7850 amp

    Hi,

    Been browsing around for better priced parts for my 1st carpc unit and found this out:


    these with green speakers plug goes for 25$ free shipping to Brazil (dunno if I can post where I found it, since we are on a store forum)



    these are the ones sold by mp3car for 80$.


    what`s the difference between these 2?

  2. #2
    Low Bitrate agentq's Avatar
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    I dont know if I would call it a stores forum so much as a community forum that happens to have a store. Well I cant see the first picture let alone no specs are posted but assuming they are the same product, I can tell you why I buy from mp3car.
    Yes the price may be more then others but like most things in life you get what you pay for.
    For example: I made a large order and couple things were messed up but by far mp3car went the extra mile to make returns and exchanges as painless as possible compared to other online retailers I have had to deal with.

    Also it helps support this site where you can get pretty decent support on you carpc needs.

  3. #3
    MySQL Error soundman98's Avatar
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    ^ what he said, though with you being in brazil, it might be cheaper to get the other one, considering how expensive shipping is for things going out of the US...


    they appear to be the same, but be forewarned-- you need a heatsink on the chipset, otherwise, you'll burn up the amp in a matter of minutes. if you search for nivanov's(i think that's his forum name-- check the mp3car thread on this amp's release-- i linked to his build thread there as well) build thread, he covers what seems to some decent methods for this..

  4. #4
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    Hey! I did buy this amp on ebay and it does a decent job, and it doesn't get that hot. However, I found another amp on ebay on the same chip - search for "TDA7850 with denoiser". It has ground loop isolators onboard along with other noise suppressing circuitry. I'm not sure what the quality of it is, though - I just ordered it several days ago, so I should be getting it in about 2 weeks. It also costs $25 shipped, so I figured I'd give both of them a shot.

    For the amp you have listed in this thread, I recommend you get a northbridge heatsink and thermal-epoxy it to the chip. I used Arctic Silver epoxy and it works really well. One thing though - make sure the amp and the heatsink fit OK - that epoxy is permanent

    EDIT: Here's a pic of the other amplifier:
    Last edited by nivanov; 05-24-2011 at 11:13 PM.

  5. #5
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    @nivanov, since you already have a TDA7850 amp, what made you buy the other amp from ebay? What's the importance of denoiser and it having ground loop isolators onboard?
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  6. #6
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    Quote Originally Posted by blackflux View Post
    @nivanov, since you already have a TDA7850 amp, what made you buy the other amp from ebay? What's the importance of denoiser and it having ground loop isolators onboard?
    I needed ground loop isolators to get rid of a ground loop hum that appeared in my system. I also heard that the alternator can cause additional noise, which can also be solved by putting inline group loop isolators. Originally, I bought the first TDA7850, the smaller one. I added a breadboard to it with 4 GLIs and 4 RCA inputs, which i relocated from the amp itself (they were pointing down and were not suitable for my use anyhow). That solution worked well but was too bulky - and I'm very tight on space.
    Another reason is that the first amp has speaker outputs on both sides, which is awkward. The other amp's speaker outputs are all on one side, which is perfect since that side will line up with the speaker jack holder in my case.

  7. #7
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    @nivanov, ok cool, did you receive the new amp yet and if so how does it compare to the first the amp?
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  8. #8
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    Quote Originally Posted by blackflux View Post
    @nivanov, ok cool, did you receive the new amp yet and if so how does it compare to the first the amp?
    Shipping is taking two weeks. I just checked the tracking and I think i'll be getting it today. I'll let you know how it goes

  9. #9
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    TDA7850 with Denoiser standby and mute functions

    I ordered the same TDA7850 with the DeNoiser Function you are showing last week, But I'm in Canada, and there is a looming postal strike, I don't know when I will receive it.
    It shows coming with a heatsink and tube of glue, is this sufficient if mounted in the open behind the LCD in the dash?
    Also, circuit board diagrams on the site show a standby a mute function, I have a M2-ATX with a line that is suppose to go to the amp to prevent popping, are you using either the standby or mute for this purpose?
    Thanks
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  10. #10
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    Quote Originally Posted by TheMadTinker View Post
    I ordered the same TDA7850 with the DeNoiser Function you are showing last week, But I'm in Canada, and there is a looming postal strike, I don't know when I will receive it.
    It shows coming with a heatsink and tube of glue, is this sufficient if mounted in the open behind the LCD in the dash?
    Also, circuit board diagrams on the site show a standby a mute function, I have a M2-ATX with a line that is suppose to go to the amp to prevent popping, are you using either the standby or mute for this purpose?
    Thanks
    The previous amp - TDA7850 without any denoiser stuff - I mounted a pretty large northbridge heatsink on it, thinking - hey the bigger the better. It was WAY overkill. Looking at the same amp on mp3car, they have a small heatsink, about the size of the chip itself. This one is over twice the length of the chip and has taller fins. I can't guarntee it, but I bet it's big enough to keep the chip cool.

    The schematics show the StandBy and Mute functions, but I'm not sure how to use them. Maybe someone who can read the schematics comment on what to do to use them? I was just gonna put a relay on V-in and control that with a serial port.

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