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Thread: Using M3-ATX for VIA EPIA N800-10E

  1. #11
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    Update: So I have ordered the TDA7580 I posted in my last reply… let's see whether I will hear pop sound even if I don't do any anti-thumping...

  2. #12
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    Hi Ivan,

    I saw that it was a delay on my post also, due to moderators maybe;

    Now it's clear that it supports anti thump function, though in your posted pic it's not in automotive mode is in dumb mode, is this window and settings applicable in the automotive mode also?

    I asked the same question to the mini-box support, and they responded with a lot of delay , I will post their reply here tomorrow as I have it on my office email.

    Thanks very much,
    Silviu
    Last edited by esilviu; 11-26-2013 at 12:46 PM.

  3. #13
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    Quad7850_user_guide.pdf

    Concerning the amp you found I think is similar to the one in the pic, and even if having pop noise suppression it is recommended to use an antithump wire together with a relay to delay its start-up. Please read the instructions in the attachment

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  4. #14
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    esilviu,

    Yes it was in dumb mode when I captured the screenshot, but as you see in the picture the name of the setting is "Automotive Mode: Thump timeout" - clearly it is for Automotive Mode. I've done my bench tests in both automotive mode and script mode. Only dumb mode allows activation of the USB device without a active 12V input and it makes my screen shot taking from my desktop a little bit easier…

    I am aware of Quad7850 from bybyte - I almost wanted to get one. The one (and many similar items) I found from ebay is very similar to Quad7850 that they both use the same 4 x 50 W MOSFET quad bridge power amplifier:

    http://www.st.com/web/catalog/sense_...C1761/PF157947
    http://www.st.com/st-web-ui/static/a...CD00145702.pdf (datasheet)

    but those from ebay have a denoiser (BA3121) as well:

    http://www.digikey.com/product-detai...3121-ND/658300
    http://media.digikey.com/pdf/Data%20...BA3121_F_N.pdf (datasheet)

    (Actually, they use one per 2 channels, and so two BA3121 per item)

    You can checkout the schematic of it from one of the ebay postings, it's extremely clear and easy to understand:



    I don't have a clear look at Quad7850, but I can't find any 8-DIP package from these pictures:

    http://www.auctiva.com/hostedimages/...0,0,0&format=0

    And as the document of Quad7850 suggests, it requires group loop isolation so it's quite unlikely it has BA3121 or any equivalent.

  5. #15
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    Hi Ivan,

    This is the answer I received from mini-box:

    Dear Silviu,

    Sorry for the delayed reply. You can use the Vaux (J10) connector as an anti-thump. Should you need other details, please contact us!

    On Thu, 21 Nov 2013, [email protected] wrote:
    > In other words , in the description of this DCDC-USB 200 is written :' Remote ON/OFF switch capable of switching up to 6A, 8A peak' - could this feature be used to remote on(enable) with a delay a car amplifier to avoid the big pop noise in the speakers when the carpc is started?
    >
    > Thanks very much in advance.
    > Silviu
    >
    > -----Message d'origine-----
    > De : Silviu Enache
    > Envoyé : 21 noiembrie 2013 13:24
    > À : 'Mini-Box.com Customer Support'
    > Objet : RE: [Support- #NBK-43358-988] DCDC-USB-200
    >
    > Dear Cristi,
    >
    > I know about M3-ATX, it was my first choice , but as I said my
    > motherboard is a thin mini itx with a jack DC 12V connection type, or
    > M3-ATX has a 20 pin ATX connection
    >
    > For DCDC USB 200 I saw in the manual that it has 3 outputs VOUT, VAUX,
    > PWS which can be programmed VOUT and PWS are clear for me , but VAUX what is this , could it be used as a delayed trigger 12v for the amplifier?
    >
    > Thanks very much in advance,
    > Silviu
    >
    >
    >
    > -----Message d'origine-----
    > De : Mini-Box.com Customer Support
    > [mailto:[email protected]]
    > Envoyé : 21 noiembrie 2013 12:57
    > À : Silviu Enache
    > Objet : Re: [Support- #NBK-43358-988] DCDC-USB-200
    >
    > Dear Silviu,
    >
    > Thank you for contacting us and your interest in our products! The DCDC-USB-200 does not have an "anti-thump" connector but all the M series automotive power supplies have one. For example, you can check the M3-ATX.
    > Should you need other technical details, please contact us!
    >
    > On Wed, 20 Nov 2013, [email protected] wrote:
    > > Dear Support team,
    > >
    > > I have a thin mini-itx Intel chipset motherboard, which I want to use it for a car pc project.
    > > This motherboard has a DC connector for 12V or 19V settable through jumpers.
    > >
    > > I decided to use for it as power supply your board DCDC-USB-200.
    > >
    > > Could you please indicate me if this board has a setting option for
    > > an "Anti-Thump" Amplifier remote control, in order to connect to my
    > > amplifier
    > >
    > > Thank you very much in advance
    > >
    > > Best Regards,
    > > Silviu ENACHE
    > >
    > >
    > > ________________________________
    > > Before printing, please think about ENVIRONMENTAL responsibility!
    >
    >
    > Best regards,
    > Cristi Ciubotaru.


    Best regards,
    Cristi Ciubotaru.

  6. #16
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    Concerning the TDA 7850 , you're right the variant you found on the ebay with denoiser is much more better then the Quad7850 from all point of view price and quality,

    I read some very good review on this link - is a very long thread, but full with very usefull info - http://www.mp3car.com/worklogs/14566...roject-23.html

    Thanks very much

  7. #17
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    Hi esilviu,

    If I remember correctly, timing of Vaux is totally controllable in script mode. I didn't test the "Automotive Mode: Thump timeout" in automotive mode, if this timeout value is actually for Vaux then it will make perfectly sense. I will test it tomorrow.

    I just received my TDA7850 today. It doesn't look as nice as it is in the ebay pictures:

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    the soldering job can be better done and there's some little scratches here and there, but I hope it will work as expected. I need to find a way to bench test it though.

    Thanks,
    -Ivan

  8. #18
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    Hi Ivan,

    Did you succeed to test your new amp? If yes how did you find it from audio quality/clarity point of view. I heard only good opinion about this amp.
    I'm thinking about buying one - it's a small amp which fit very well behind the dash , a perfect solution for a carpc if the audio quality/clarity is comparable with the one from the OEM car head unit. Waiting your findings. Thanks

  9. #19
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    Hi Ivan, Happy New Year 2014!
    Any news on the quality/clarity of the sound amplified with your ebay TDA7850, is it comparable with OEM car head unit?
    Thanks.

  10. #20
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    Hey, it's great to get mentioned in a thread I'm not even participating in
    I'm currently working on a second version of an all-in-one car pc, using Intel NUC. I'll be posting my worklog soon. I'm using the same exactly amplifier that OP is using - it's the newer version of the one I used in my previous build. It uses standard headphone jacks instead of a JST connector I had to use. Unless they messed up the design in this new version, I highly recommend this amp. You get a whole lot of functionality for $35!

    Nik
    ------------------------------------------------------------
    My Project: All-in-one Double Din Unit

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