resister get burned

Discussion in 'General Electronics Chat' started by prakashkovaidt, Jan 2, 2015.

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  1. prakashkovaidt

    Thread Starter New Member

    Feb 4, 2014
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    hai ,

    i've 5v 1A power supply, which is not working. reason is resistor get burned.

    its position is direct to AC line.
    Circuit:-
    ~L___________Bridge rectifier(Input 1)

    ~N____________Resister(Burned)______Bridge Rectifier(Input 2)

    i cant figure out resister value.fully burnt black

    Please tell me any idea about choosing right resister.

    I checked 10K and 1K resister . but dont know watt valve.

    im totally newbie for electronics. and this 4M.

    Thank you
     
  2. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    1,438
    368
    Do you think that the reason the resistor burnt out was, perhaps, due to a fault further down the line i.e. the problem is not a faulty resistor?
    Incidentally, no one knows what value the resistor (if it was a resistor) should be or what it's for.

    Since it is connected directly to the mains and putting the wrong device in could be dangerous; it is time for a new power supply.
     
    Last edited: Jan 2, 2015
  3. prakashkovaidt

    Thread Starter New Member

    Feb 4, 2014
    3
    0

    Thanks G.

    I can see some burnt color code in resister.
    now i got another idea. surely i dont know this is correct

    the bridge rectifier have 2 AC inputs. may i connect direct AC to Bridge rectifier Input pin ,? is it right?
     
  4. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    1,438
    368
    No, it is not right.

    The resistor/unknown device was there for a reason, possibly over-current protection, in which case it has responded to an over-current situation (caused by a fault elsewhere in the power supply) by burning itself rather than burning your house down.

    Replace the power supply, there is nothing else to add.
     
  5. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,361
    Discussion of power supplies without proper AC mains transformer is against AAC rules.

    This thread is closed.
     
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