Silly question

A Sanchez · 17th May 2009, 12:13 AM

I'm totally ignorant when it comes to voltage, current vac, va etc, etc and there is something I have not found an answer anywhere on the net.

I have a couple of 300VA 230V 2 x 22V toroidal transformers and I have moved to the USA. What happens if I connect them in a 110V mains? Will they not work at all? Will they become 150VA? Or what?
Thanks

zigzagflux · 17th May 2009, 04:07 AM

Yes, they will work. You end up with a 150VA transformer, and the secondary voltage will be 2 x 11V.

The transformer will be running at 50% of its designed core flux, and will run quite cool. I wouldn't be too concerned about considering it a 200VA transformer; the core tends to limit capacity more than the winding current, especially in this case where the core will be cool.

A Sanchez · 17th May 2009, 05:13 AM

Thanks for your answer zig.

I'm glad they will work. However, I will have to use them in another project because I do need at least 18v on the secondaries.

I will have to sell them.

Regards

Antonio

A Sanchez · 17th May 2009, 05:09 PM

Just another question on the same subject.

If I connect the two trafos in parallel will I double the secondaries' output back to 22v??

Basically if the above is true, this way I can still use the trafos but in stead of having one per channel I will have one for both channels.

Thanks

Mr Evil · 17th May 2009, 06:07 PM

You can connect the primaries in parallel and the secondaries in series to get a single pair of 22V outputs.

star882 · 17th May 2009, 07:17 PM

Don't forget that you can get 240v in the US by connecting from hot to hot.

DRNB · 17th May 2009, 08:59 PM

You will have to connect the two secondary taps in series to get 22V.

A Sanchez · 19th May 2009, 12:53 AM

Many thanks for your answers. Although I'm doing y homework I will hae to ask more questions since a mistake could be dangerous.

Quote:

Originally posted by star882
Don't forget that you can get 240v in the US by connecting from hot to hot.

Could you or someone else explain what this means? I live in an apartment and have no access to the electricity board. Just to normal double (wall) sockets.

Also, I do not want to end up doing the wrong thing as explained here: http://www.avahifi.com/root/audio_ba.../ab1993-08.pdf

Quote:

Originally posted by DRNB
You will have to connect the two secondary taps in series to get 22V.

Is this asuming I do what star882 explained above?

Many thanks

A Sanchez · 19th May 2009, 01:37 AM

Ah, by the way, this is the way my transformers are wired.

http://www.airlinktransformers.com/t...ansformers.asp

17th May 2009, 12:13 AM	#1
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	Silly question I'm totally ignorant when it comes to voltage, current vac, va etc, etc and there is something I have not found an answer anywhere on the net. I have a couple of 300VA 230V 2 x 22V toroidal transformers and I have moved to the USA. What happens if I connect them in a 110V mains? Will they not work at all? Will they become 150VA? Or what? Thanks

17th May 2009, 06:07 PM	#5
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	You can connect the primaries in parallel and the secondaries in series to get a single pair of 22V outputs. __________________ https://mrevil.asvachin.eu/

17th May 2009, 07:17 PM	#6
star882 diyAudio Member Join Date: Mar 2007	Don't forget that you can get 240v in the US by connecting from hot to hot. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

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17th May 2009, 04:07 AM	#2
zigzagflux diyAudio Member Join Date: Oct 2006	Yes, they will work. You end up with a 150VA transformer, and the secondary voltage will be 2 x 11V. The transformer will be running at 50% of its designed core flux, and will run quite cool. I wouldn't be too concerned about considering it a 200VA transformer; the core tends to limit capacity more than the winding current, especially in this case where the core will be cool.

17th May 2009, 05:13 AM	#3
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	Thanks for your answer zig. I'm glad they will work. However, I will have to use them in another project because I do need at least 18v on the secondaries. I will have to sell them. Regards Antonio

17th May 2009, 05:09 PM	#4
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	Just another question on the same subject. If I connect the two trafos in parallel will I double the secondaries' output back to 22v?? Basically if the above is true, this way I can still use the trafos but in stead of having one per channel I will have one for both channels. Thanks

17th May 2009, 08:59 PM	#7
DRNB diyAudio Member Join Date: Jan 2008	You will have to connect the two secondary taps in series to get 22V.

19th May 2009, 01:37 AM	#9
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	Ah, by the way, this is the way my transformers are wired. http://www.airlinktransformers.com/t...ansformers.asp

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