how to lower the ac voltage without using a transformer

Discussion in 'General Electronics Chat' started by suparu, May 23, 2012.

Thread Status:
Not open for further replies.
  1. suparu

    Thread Starter New Member

    May 23, 2012
    1
    0
    how to lower the ac voltage without using a transformer, because it's small.example of an ac voltage of 128 v to 110v,1500 watts of power used how?
     
  2. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
    Use a resistive voltage divider.
     
  3. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    At 1500 watts?:eek:
     
  4. PatM

    Active Member

    Dec 31, 2010
    81
    72
    What is marked as 110V can easily vary quite a bit depending on the load on the system.
    When working days and then nights it was not exceptional to see the voltage actually swing up into the 120's during different times of the day.
    None of the test equipment was damaged by this.
     
  5. ajm113

    Member

    Feb 19, 2011
    176
    5
    I think it maybe would be better to use a non-polarized cap, but very careful when working with them. Just look up capacitor transformers.
     
    Last edited: May 23, 2012
  6. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    This thread violates the forum's guidelines, and will be closed very shortly, if history is any guide.
     
  7. WBahn

    Moderator

    Mar 31, 2012
    17,760
    4,800
    So any discussions about a power supply are forbidden unless the supply has a transformer? So if someone wants to make a low-current 5V supply to run off a 9V battery, they have to figure out some way to use a transformer in it before they can ask questions? Or if a thread discussion lent itself to me describing how the very low noise 1000A programmable current supply I worked with at NIST works, that would be off-topic and forbidden because it doesn't have any transformers in it?
     
  8. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    No, it only relates to mains-powered supplies. A moderator can answer any further questions.
     
  9. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    And so he shall.

    There is no way you can make a safe power supply without the isolation of a transformer. Trying to merely drop the voltage is a reciepe to injure or kill someone, as there are various senario's that could expose someone to the mains. A transformer offers true isolation, and is considered safe.

    It is important enough that we specifically mention it in out Terms of Service (ToS):

    We'll be willing to discuss alternate idea on a different thread.
     
    PackratKing likes this.
Loading...
Thread Status:
Not open for further replies.