Is there a resistor available for 330v supply?

Discussion in 'General Electronics Chat' started by victorment, Mar 11, 2011.

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  1. victorment

    Thread Starter Member

    Jul 4, 2010
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    Is there a resistor for a 330v DC supply?
     
  2. mkbutan

    Senior Member

    Sep 30, 2008
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    for what u want to limit the current or to drop the voltage
    yes its available for both
    search the google
     
  3. victorment

    Thread Starter Member

    Jul 4, 2010
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    I would like to build a transformerless power supply. here is my circuit. please tell me if it is correct.
     
  4. S_lannan

    Active Member

    Jun 20, 2007
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    Don't build that, you'll probably electrocute yourself.
    This type of power supply is not safe.

    I cannot see any schematics posted either.
     
  5. victorment

    Thread Starter Member

    Jul 4, 2010
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  6. S_lannan

    Active Member

    Jun 20, 2007
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    Well to put it short every node in that circuit past the bridge rectifier will be at full mains potential... Including what you might think is 'ground'.
     
  7. victorment

    Thread Starter Member

    Jul 4, 2010
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    is this right? having a 30v dc output on the load resistor when It simulate it?
     
  8. victorment

    Thread Starter Member

    Jul 4, 2010
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    can I use 5 watts resistor on this?
     
  9. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    This thread will/should be locked. A transformerless supply is not safe for an amateur and thus should not be discussed here.
     
  10. victorment

    Thread Starter Member

    Jul 4, 2010
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    Its our project for my school
     
  11. mkbutan

    Senior Member

    Sep 30, 2008
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    are you trying to make AC/DC converter?

    normally in these cases cant depend on the capacitors (it blow's off)
    even there will be so much of heat energy will be produce your ckt. will not last for long.

    have you calculated the resistor valves 110Ω before sketch mate

    :rolleyes:

    Mr.MCGYVR is right
    This thread will/should be locked. A transformerless supply is not safe for an amateur and thus should not be discussed here.
     
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  12. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Even more of a reason to NOT use a transformerless supply. And your teacher "should" know better than to allow this as a project.
     
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  13. victorment

    Thread Starter Member

    Jul 4, 2010
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    its our project a transformerless power supply with 24v output and 2 amps. can someone help me.
     
  14. mcgyvr

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    Oct 15, 2009
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    If your teacher truly allowed this project then you should be talking to him/her. Your teacher should be held 100% liable in this case.
     
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  15. victorment

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    Jul 4, 2010
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    but the teacher gave us this project. I can't do anything about it.
     
  16. Papabravo

    Expert

    Feb 24, 2006
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    It does not matter what it is for. Stop before you hurt yourself or one of your students. No responsible member of the forum will help you in any way. Done, period, full stop.
     
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  17. mkbutan

    Senior Member

    Sep 30, 2008
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    SORRY SORRY SORRY cant help
    you are not mature enough to handle this project tell your teacher to change the project


    Accidents are never Invited but they Occur
     
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  18. SgtWookie

    Expert

    Jul 17, 2007
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    You MUST use a transformer of some type to isolate the output from mains power.
    There is no other way to make it safe.

    Transformers are remarkably inexpensive compared to a funeral.

    Please do not attempt to build a transformer-less mains-powered supply.
     
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  19. beenthere

    Retired Moderator

    Apr 20, 2004
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    All of the above warnings are correct and honestly meant. That circuit is deadly.
     
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