Transformers.

Damon_McC · 10th May 2007, 09:21 AM

Hey,

Just wondering as i carnt find anything on the search.

Is there any difference using a toroidal transformer compared to the normal type seen on most of the designs?

Regards
Damon

Tubes4e4 · 10th May 2007, 12:01 PM

Hi Damon,

which duty are you refering to - power transformer or output transformer?

Regards,

Tom

Damon_McC · 10th May 2007, 12:13 PM

Either?

Got some experience of winding transformers but was just wondering out of intrest.

Damon

Shoog · 10th May 2007, 02:16 PM

In power transformer duty a toroidal will allow much more high frequency hash. In this case it will perform worse in terms of audio than an EI transformer. However they are more compact and efficient.

For output duty the toroidal will have better bandwidth than a comparable EI transformer. However in PP duty it will not tolarate any DC between the sides or it will saturate. This can be compensated for in the circuit design. In a SE design they need to be used as parafeed transformers, ie no DC in the transformer.

Piltron do a range of toroidal output transformers which have air gaps incorporated. These allow them to be used with current unbalanced PP stages, and as SE transformers.

Shoog

10th May 2007, 09:21 AM	#1
Damon_McC diyAudio Member Join Date: May 2007	Transformers. Hey, Just wondering as i carnt find anything on the search. Is there any difference using a toroidal transformer compared to the normal type seen on most of the designs? Regards Damon

10th May 2007, 12:01 PM	#2
Tubes4e4 diyAudio Member Join Date: Jul 2005 Location: Leverkusen	Hi Damon, which duty are you refering to - power transformer or output transformer? Regards, Tom __________________ If in doubt, just measure.

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10th May 2007, 12:13 PM	#3
Damon_McC diyAudio Member Join Date: May 2007	Either? Got some experience of winding transformers but was just wondering out of intrest. Damon

10th May 2007, 02:16 PM	#4
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	In power transformer duty a toroidal will allow much more high frequency hash. In this case it will perform worse in terms of audio than an EI transformer. However they are more compact and efficient. For output duty the toroidal will have better bandwidth than a comparable EI transformer. However in PP duty it will not tolarate any DC between the sides or it will saturate. This can be compensated for in the circuit design. In a SE design they need to be used as parafeed transformers, ie no DC in the transformer. Piltron do a range of toroidal output transformers which have air gaps incorporated. These allow them to be used with current unbalanced PP stages, and as SE transformers. Shoog

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