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

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

1. ### 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*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,505
2,849
Jan 21, 2010
Get a 220 to 120 V transformer

3. ### 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

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

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*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,505
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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.