The Problem with MAX038 bought from China.

Discussion in 'The Projects Forum' started by Lindembruck, Feb 28, 2016.

  1. Lindembruck

    Thread Starter Member

    Feb 28, 2016
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    1
    Mods Edit:
    Please don't hijack other member's thread, now your have your own.
    This thread was split from -- Problem with MAX038 Function Generator IC.
    The TS(Thread Starter) already leave for 1 and half year, so he can't answer your question.


    Hi Eric!

    I bought two MAX038 from China and got same problem with the same schematic circuit but with 7905 x 7805 power supply as technical need.
    Both chips got the same amperes as your and get hot as your.

    Do you got your problem solve in your old times?

    Waiting from you.
     
  2. Lindembruck

    Thread Starter Member

    Feb 28, 2016
    32
    1
    Here is it!
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. Lindembruck

    Thread Starter Member

    Feb 28, 2016
    32
    1
    Hi SIr.!

    Thanks to replay me.
    Yes, I place the caps as in the datasheet.
    Include,in the power supply, I place too because wire inductance.

    I did the both prototyping circuits, the one in the main datasheet chip, page 11

    https://datasheets.maximintegrated.com/en/ds/MAX038.pdf

    and the one in the "Product Reliability Reports: MAX038.pdf" page 9

    https://www.maximintegrated.com/en/reliability/product/MAX038.pdf

    Both as they are there inlude all as in the datasheet 7805/7809 about capacitors and filters.
     
  5. Lindembruck

    Thread Starter Member

    Feb 28, 2016
    32
    1
    This is the actual oscilloscope print screan.

    The negative conector get 1.31 A and in the way to the chip get hot, the Ampere decrease.
    The 7905 get so hot to need to place a massive heat sink.
     
  6. Lindembruck

    Thread Starter Member

    Feb 28, 2016
    32
    1
    When the chip arrived at home, I opened for both a similar dispute because both, one from ebay and other from Aliexpress site, where I found the dispute in both same cases, about both has arrived with the pins marks of has been inserted before.
     
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