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Wall Wart Question

Discussion in 'General Electronics Discussion' started by alfa88, Mar 24, 2012.

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  1. alfa88

    alfa88

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    Dec 1, 2010
    I'm reverse engineering a cheap wall wart and I think I have the circuit pretty well traced, One problem I have is some of the diodes have odd numbers D5, D6 and unlabeled 'C11PH' . Another question I have is where is the regulation coming from?
     

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    Last edited: Mar 25, 2012
  2. duke37

    duke37

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    Jan 9, 2011
    It looks as if the feedback is through the optical isolator. When Q1 on, it inhibits the oscillator (Q2)
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    C11PH is almost certainly a 3V3 zener (or thereabouts)
     
  4. alfa88

    alfa88

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    Dec 1, 2010
    Thanks Steve. C11P is indeed a zener. I ran a check and had a WTH moment then I remembered I was dealing with a 12V wall wart not 5V. C11P is 11V. Rather than producing a separate board the Chinese company that made this simply exchanged parts to suit the higher voltage. The silkscreen on the board is for 5V.
     
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