Hello

I got this transformer from an old ups, there are four wires on the primary side black, blue, green , yellow and two on the secondary red and blue. This transformer used to charge 12v 7.5ah battery also converts it back to 220V in backup mode.
Tried testing its output and got this

(Mains 220V)
Black to ground
Blue to mains-> 7.9v on secondary
Green->5.5v
Yellow->6.5v

Connecting Blue and Green to mains and it was a shot circuit and blown my fuse. I want to use this for making a decent power supply 12v+ output, is this possible?

I also saw this video https://www.youtube.com/watch?v=mc4GZM-kFUY&hd=1
The guy is using his ups transformer for generating hv to power cfl using tip122, i am not sure how to do this using my transformer.

I need to make use of this transformer somehow, otherwise its just eating dust at my home.

 

Seems similar one that I have. Boy! These are strong babies

THIS thread will answer all your doubts I hope-

http://forum.allaboutcircuits.com/showthread.php?t=82028

Here's the chart-

http://forum.allaboutcircuits.com/attachment.php?attachmentid=53914&d=1364462719

 

Hello

I got this transformer from an old ups, there are four wires on the primary side black, blue, green , yellow and two on the secondary red and blue. This transformer used to charge 12v 7.5ah battery also converts it back to 220V in backup mode.
Tried testing its output and got this

(Mains 220V)
Black to ground
Blue to mains-> 7.9v on secondary
Green->5.5v
Yellow->6.5v

Connecting Blue and Green to mains and it was a shot circuit and blown my fuse. I want to use this for making a decent power supply 12v+ output, is this possible?

I also saw this video https://www.youtube.com/watch?v=mc4GZM-kFUY&hd=1
The guy is using his ups transformer for generating hv to power cfl using tip122, i am not sure how to do this using my transformer.

I need to make use of this transformer somehow, otherwise its just eating dust at my home.

I see numbers on the transformer , and I would suggest googling those numbers , and see what comes up !

 

Seems similar one that I have. Boy! These are strong babies

THIS thread will answer all your doubts I hope-

http://forum.allaboutcircuits.com/showthread.php?t=82028

Here's the chart-

http://forum.allaboutcircuits.com/attachment.php?attachmentid=53914&d=1364462719

Well, thanks for the info, but i don't think the windings are similar, what you have is multitap transformer and what i have seems to have only two windings for main primary and secondary and its output voltages are right above, and it can't be that this huge thing only giving about 7.9v max.

 

I see numbers on the transformer , and I would suggest googling those numbers , and see what comes up !

I did before asking here, nothing important comes up.

 

Find the winding with the most ohms. That will be the 220v winding.

That should be safe to connect to the mains, but PLEASE connect it through a 2A fuse when you test it.

 

Google again! Maybe you are lucky.

http://www.vikingcontrols.com/Products/Results.asp?CategoryID=433&functype=buildnewsearch

 

I've attached a section from the ARRL handbook concerning the identification of unknown transformers. It offers some helpful suggestions.

 

Well, i am not really sure what happened. I was wondering myself with the weird voltage outputs. I was testing voltages by using only bridge rectifier made of 1N4007, outputs were same as written above. Now i thought why not try filter the output using capacitor. And i putted 1000uf 25v in the output and here we go 12v output clean and stable output. Now green 8v, yellow 9v and blue 12v. Any comment on this?

 

in the earlhy days of radio, transformer windings were color coded and the various manufacturers used the same color codes. I dont know when things changed, but it sould sure be nice if they standardized them again. such as black for primary and such.