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How to get 120v from 220 v using these transformers?

Discussion in 'Electronics Homework Help' started by nero, Dec 3, 2010.

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  1. nero

    nero

    8
    0
    Oct 27, 2010
    How to get 120v AC from 220 v AC using these transformers and diodes?

    1st transformer: takes 220v and the o/p is 6v :3 legs (6v and 0v and 6v)


    2nd transformer: takes 6v and the o/p is 220v :2 legs (0v and 220v),however WHEN I connected it to the o/p of the 1st transformer (the 6 volts) it didn't give exactly 220 it gave only 186v -i think this is due to losses in the transformers themselves or connections-if someone knows exactly why plz tell?!!!


    and diodes......

    tell me what would be the connection of the cct so we can achieve a voltage of 120v..
    many thanks
     
    Last edited by a moderator: Dec 4, 2010
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,505
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    Jan 21, 2010
    Get a 220 to 120 V transformer
     
  3. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    6-0-6V=12V. How exactly did you connect this to the 2nd xformer? Does the 2nd xformer also have 6-0-6V? Unloaded xformers usually give out more than they "should".
     
  4. nero

    nero

    8
    0
    Oct 27, 2010
    i didn't connect anything to anything...som1 proposed a certain connection bet those 2 transformers with diodes bet them but when i tried it ,it only gave 46 volts!,,,so i need the right config..thx
     
  5. nero

    nero

    8
    0
    Oct 27, 2010
    the second trans have 2 legs i/p and 2 legs o/p 0,220 and 0,6
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,505
    2,849
    Jan 21, 2010
    Diodes are exactly what you don't need.

    The best configuration would be 20 start with 220VAC to 6VAC and connect the 6VAC to the 12VAC winding of the second transformer (6-0-6 is 12V centre tapped). The 220V winding will have approximately 110VAC appear on it.

    The voltage will likely differ substantially from the voltage you want, but it may be the best you'll get.
     
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