Low profile toroidal transformer?

giszo · 31st October 2012, 05:50 PM

I am looking for a low profile toroidal transformer. Searched through the net and it seems I will have to make it custom made as no one sells a transformer with my requirements.

It would be a simple transformer for an audio amplifier application with 300VA from 230V to 2x25V. The only special requirement for the transformer is the max height that could not be more than 38 millimeters / 1.5".

Of course I did a search here before I posted my question and saw someone mentioned Toroidy. Already asked him but unfortunately he is not able to make that custom transformer.

Do you have any idea where should I try to make that custom made?

tomchr · 31st October 2012, 06:26 PM

Can you use two 150 VA transformers instead? One for the "plus" supply and one for the "minus" supply?

The power handling capability of a transformer is proportional to the cross-sectional area of the transformer core. The actual core area depends on the core material and such, but there isn't a whole lot of flexibility there. It sounds like you're up against the laws of physics. Let me tell you from experience ... physics always wins!

~Tom

giszo · 31st October 2012, 06:36 PM

I see no reason why I could not use two 150 VA transformers.

The only problem I could think of is the size that two transformers require two times the space required by one.

I will figure this out when I found a suitable transformer with its outside diameter specified.

Anyway, I do not want to go against the laws of physics, I am just thinking, planning and asking - fool questions sometimes

.

giszo · 1st November 2012, 08:23 AM

@tomchr, do you know a place where I could buy or ask them to make a 150VA transformer for that height?

Checked again various sites selling transformers but in the desired power range (150VA) none of them sell a transformer with the maximum height I am looking for.

Marra · 1st November 2012, 09:18 AM

Toroidy.pl make excellent transformers and I would imagine could give good advise as to whether its doable in that height.I seem to remember Naim used big VA transformers but they always seemed relatively low profile but with a big diameter.

giszo · 1st November 2012, 11:53 AM

Asked Toroidy again with the new idea of using 2x150VA transformers.

Nisbeth · 1st November 2012, 09:51 PM

Two of these?

Transformateurs torique - Transformateur torique 160VA 2x24V

130x30mm according to the data?

/U.

mickeymoose · 2nd November 2012, 02:16 PM

Powertronix Corporation: Low Profile Toroidal Transformers for the Medical, Vending, Audio, Automation, Renewable, and Power Quality Applications

giszo · 6th November 2012, 06:47 PM

@Nisbeth: that is a good idea to use two separate transformers. I have no idea how this does not come into my mind.

@mickeymoose: this is also a nice option, I will ask them for pricing.

31st October 2012, 05:50 PM	#1
giszo diyAudio Member Join Date: Oct 2012	Low profile toroidal transformer? I am looking for a low profile toroidal transformer. Searched through the net and it seems I will have to make it custom made as no one sells a transformer with my requirements. It would be a simple transformer for an audio amplifier application with 300VA from 230V to 2x25V. The only special requirement for the transformer is the max height that could not be more than 38 millimeters / 1.5". Of course I did a search here before I posted my question and saw someone mentioned Toroidy. Already asked him but unfortunately he is not able to make that custom transformer. Do you have any idea where should I try to make that custom made?

31st October 2012, 06:26 PM	#2
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	Can you use two 150 VA transformers instead? One for the "plus" supply and one for the "minus" supply? The power handling capability of a transformer is proportional to the cross-sectional area of the transformer core. The actual core area depends on the core material and such, but there isn't a whole lot of flexibility there. It sounds like you're up against the laws of physics. Let me tell you from experience ... physics always wins! ~Tom __________________ 21st Century Maida Regulator, Universal Filament Regulator, 300B Driver PCBs, and more... Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right

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31st October 2012, 06:36 PM	#3
giszo diyAudio Member Join Date: Oct 2012	I see no reason why I could not use two 150 VA transformers. The only problem I could think of is the size that two transformers require two times the space required by one. I will figure this out when I found a suitable transformer with its outside diameter specified. Anyway, I do not want to go against the laws of physics, I am just thinking, planning and asking - fool questions sometimes .

1st November 2012, 08:23 AM	#4
giszo diyAudio Member Join Date: Oct 2012	@tomchr, do you know a place where I could buy or ask them to make a 150VA transformer for that height? Checked again various sites selling transformers but in the desired power range (150VA) none of them sell a transformer with the maximum height I am looking for.

1st November 2012, 09:18 AM	#5
Marra diyAudio Member Join Date: Nov 2009 Location: Near Lincoln	Toroidy.pl make excellent transformers and I would imagine could give good advise as to whether its doable in that height.I seem to remember Naim used big VA transformers but they always seemed relatively low profile but with a big diameter.

1st November 2012, 11:53 AM	#6
giszo diyAudio Member Join Date: Oct 2012	Asked Toroidy again with the new idea of using 2x150VA transformers.

1st November 2012, 09:51 PM	#7
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	Two of these? Transformateurs torique - Transformateur torique 160VA 2x24V 130x30mm according to the data? /U.

2nd November 2012, 02:16 PM	#8
mickeymoose diyAudio Member Join Date: Nov 2008	Powertronix Corporation: Low Profile Toroidal Transformers for the Medical, Vending, Audio, Automation, Renewable, and Power Quality Applications

6th November 2012, 06:47 PM	#9
giszo diyAudio Member Join Date: Oct 2012	@Nisbeth: that is a good idea to use two separate transformers. I have no idea how this does not come into my mind. @mickeymoose: this is also a nice option, I will ask them for pricing.