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Thread: Boom Died...

  1. #11
    Junior Member
    Join Date
    Feb 2013
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    17

    Boom Died...

    On Feb 12, 2018 7:10 AM, "bpa" <bpa.8ckw6n (AT) no-mx (DOT) forums.slimdevices.com>
    wrote:
    >
    >
    > The plug are compatible but that does not means the amps are
    > sufficient.
    >
    > The PSU for Radio is rated at 18v @ 1A
    >
    > Boom PSU is 12V @2.5A or 18V @ 1.67A
    >
    > So using Radio PSU would probably not have enough power.
    >
    >
    > ------------------------------------------------------------------------


    BPA,

    I have never seen anyone answer a technical question with such lack of
    technical understanding.

    You cannot do what you wrote. The Boom PSU is 12 VDC, it will not put out
    18 VDC ever.

    Plugging in the Radio PSU which is 50% higher voltage the Boom requires
    will likely destroy the Boom.

    If the original poster did what you suggested, he would likely destroy his
    Boom and you would be responsible.

    Please do not answer technical questions when you don't even understand
    fundamental DC voltage laws.

    Go take a electronics course please.

    Thank you,

    David


  2. #12
    Senior Member
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    Quote Originally Posted by djringjr View Post
    You cannot do what you wrote. The Boom PSU is 12 VDC, it will not put out
    18 VDC ever.

    Plugging in the Radio PSU which is 50% higher voltage the Boom requires
    will likely destroy the Boom.
    I never said the same PSU put out two voltages.
    I have two Booms
    - a pre-production units as I was part of beta test which has a 18V PSU original supplied by Slimdevices
    - a production unit which has a 12V PSU original supplied by Slimdevices.

    The OP did not say whether they had a pre-production unit or a production unit.

    IIRC Plugging in 18V will not destroy the boom as the internal voltage regulators are able to cope with 18V

    Look back in the forum and you will find there are many posts where users have created supplies - battery and otherwise which suppied at more than 12V e.g. http://forums.slimdevices.com/showth...l=1#post604549 and one from Dean founder of Slimdevices http://forums.slimdevices.com/showth...l=1#post333849

    I am stating the facts.
    Last edited by bpa; 2018-02-13 at 01:37. Reason: typos and link to old forum post

  3. #13
    Senior Member JoeMuc2009's Avatar
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    This isn't taking a good direction. BPA may be right eventually! I have spent days analyzing defective Boom boards and to my surprise never found a single classic voltage regulator. Up to now I thought this probably indicates a very low tolerance towards other voltages than specified. But found quite the opposite when I reviewed it today.
    There are multiple converters, and that's all I could find that deals with power rail generation:

    U3: TI TPS61080: HIGH VOLTAGE DC/DC BOOST CONVERTER WITH 0.5-A/1.3-A INTEGRATED SWITCH
    generates +55V grid voltage for the VFD, takes up to 6V input, is not directly connected to +12V rail but fed from U10

    U7: TI TPS40222: 1.6-A, 1.25-MHz BUCK CONVERTER IN A 3 mm Î 3 mm SON PACKAGE
    probably dedicated to creating CPU voltage (1.2V), takes up to 8V input, is not directly connected to +12V rail but fed from U10

    U10: TI TPS54286: 2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
    probably the main regulator, takes up to 30V input, is directly connected to the +12V power jack
    half of U10 is creating supply voltage of 3.3V for the majority of the ICs on the board such as
    • U12 (Realtek NIC)
    • U14 (Xilinx FPGA)
    • the obscure U13 (SN0801033) I cannot find any datasheet for
    • U26 (Flash EEPROM)
    • U25 (DRAM)
    • U24 (CPU)
    • and some more.

    the other half creates the supply voltage (+5V I think) for U3 and U7, and apparently also the low-voltage part of the VFD display

    Furthermore, directly connected to the input +12V are the digital amplifier chips:

    U9: TI TPA3100D2: 20-W STEREO CLASS-D AUDIO POWER AMPLIFIER (for bass woofers)
    U11: TI TPA3101D2: 10-W STEREO CLASS-D AUDIO POWER AMPLIFIER (for tweeters)

    U9 and U11 both tolerate input up to 26V.
    Here's my imagination of the internal power rails:



    So yeah, actually I cannot see a reason after all why more than +12V input should do any harm. All the regulating components which are in the path of the +12V input rail are capable of taking more than double that. It seems there is no sensitive component directly attached to the input jack that would not tolerate a good amount more than +12V.
    Certainly one should not generally assume that each low-voltage device can take an arbitrary amount of more voltage than the label on the box says but in this case we have a good margin.
    I don't have any schematics by the way. Just like everybody else I'm condemned to reverse engineering, and not particularly good at it. Please don't take my word for granted.
    Last edited by JoeMuc2009; 2018-02-13 at 04:08.


    PN me if your Boom / Classic / Transporter display has issues!

    LMS 7.9.0 on Windows Server 2012
    1x Squezeebox Classic SB2
    7x Squeezebox Classic SB3 (one waiting for repair)
    7x Squeezebox Boom (two waiting for repair)
    1x Transporter
    2x Controller (one waiting for repair)
    3x Touch (two waiting for repair)
    1x Radio

  4. #14
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    Quote Originally Posted by JoeMuc2009 View Post
    This isn't taking a good direction. BPA may be right eventually!
    This post from Caleb - one of the Slimdevices developers of the Boom confirms that 18V is OK.
    http://forums.slimdevices.com/showth...l=1#post337432

    It also confirms that 30W is needed for peak power so a 18v @ 1A - will be underpowered at high volumne but OK for normal but it is not clear whether 18V @ 1A can supply the initial significant power up rush.
    The above "external battery pack for a mobile Boom" thread is very interesting in respect of the power system as Boom has a big power rush at power up with many contributions from Caleb and Dean.
    Last edited by bpa; 2018-02-13 at 04:33.

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