Low Profile Power Transformer Help

dsavitsk · 9th March 2007, 05:15 PM

I am looking for a 250-0-250 transformer (a little higher or lower voltage is not a problem) at 40mA that is low profile enough to fit inside a chassis with 2.25" of clearance (that's 5.7cm). If it has a 5V secondary that is a great bonus, but it is not essential.

Lundahls are too expensive (and I'm not sure they would fit anyway) -- $120 is the ceiling, and even that is probably too high. Am I stuck with a toroidal? Is there somewhere to get this custom made? I would usually use electra-print, but I think they are too large in this case.

zobsky · 9th March 2007, 06:38 PM

Perhaps this toroid (or something similar) would work (about 0.25 " too large)
http://cgi.ebay.com/460V-CT-230V-220...QQcmdZViewItem

frank754 · 10th March 2007, 12:35 AM

When I have a problem finding it on the normal channels, I usually check Allied as a fallback.
This one may work for you, no 5v taps though. Shouldn't be really big with the lower ratings, and only $21:

http://www.alliedelec.com/Search/Pro...F0A38074CF617F

dsavitsk · 10th March 2007, 04:34 AM

Thanks, but it appears to be slightly too large.

ErikdeBest · 10th March 2007, 08:53 AM

Hi dsavitsk

Maybe you can work with trafo's wired back to back,
http://www.tubecad.com/january2000/page16.html

If you can find those low profile trannys cheap, from surplus, it could work out. Off course you will get lots of mass, but hey, you talked about low profile, said nothing aboutthe beed low mass or low area

Nice weekend!

Erik

stokessd · 10th March 2007, 11:35 AM

I used a toriod kit from Toroid Corp of Maryland for my tube DAC transformer. I wound a 250 volt b+ winding and a hefty filament winding plus +-15 windings for both analog and digital power. It's an 80 va transformer which is 1.7" high and about 3.5" in diameter when finished.

http://www.toroid.com/standard_trans...ormer_kits.htm

And some info on what I did with the smallest kit:

http://quadesl.com/pdf/trans_inst.pdf

Sheldon

9th March 2007, 05:15 PM	#1
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	Low Profile Power Transformer Help I am looking for a 250-0-250 transformer (a little higher or lower voltage is not a problem) at 40mA that is low profile enough to fit inside a chassis with 2.25" of clearance (that's 5.7cm). If it has a 5V secondary that is a great bonus, but it is not essential. Lundahls are too expensive (and I'm not sure they would fit anyway) -- $120 is the ceiling, and even that is probably too high. Am I stuck with a toroidal? Is there somewhere to get this custom made? I would usually use electra-print, but I think they are too large in this case.

9th March 2007, 06:38 PM	#2
zobsky diyAudio Member Join Date: Mar 2002 Location: Dallas, Tx, USA	Perhaps this toroid (or something similar) would work (about 0.25 " too large) http://cgi.ebay.com/460V-CT-230V-220...QQcmdZViewItem __________________ "Any fool can know. The point is to understand" - Albert Einstein

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Profile A1200 XL Odd Power Supply	amc32	Car Audio	5	26th November 2008 10:44 PM
best cone profile for sub ?	ejaouen	Subwoofers	12	17th June 2008 04:28 AM
profile A600 2 ch	jrod666999	Car Audio	9	18th March 2008 10:26 PM
Low Profile Desktop Power Supplies	Tom D	Solid State	11	7th August 2003 09:24 PM
toroid Transformer as power Transformer for tube	tone	Tubes / Valves	7	11th February 2003 08:57 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

10th March 2007, 12:35 AM	#3
frank754 diyAudio Member Join Date: Jan 2007	When I have a problem finding it on the normal channels, I usually check Allied as a fallback. This one may work for you, no 5v taps though. Shouldn't be really big with the lower ratings, and only $21: http://www.alliedelec.com/Search/Pro...F0A38074CF617F

10th March 2007, 04:34 AM	#4
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	Thanks, but it appears to be slightly too large.

10th March 2007, 08:53 AM	#5
ErikdeBest mostly thinkerer diyAudio Member Join Date: Mar 2003 Location: Maputo - Mozambique	Hi dsavitsk Maybe you can work with trafo's wired back to back, http://www.tubecad.com/january2000/page16.html If you can find those low profile trannys cheap, from surplus, it could work out. Off course you will get lots of mass, but hey, you talked about low profile, said nothing aboutthe beed low mass or low area Nice weekend! Erik

10th March 2007, 11:35 AM	#6
stokessd diyAudio Member Join Date: Nov 2002 Location: Fort Wayne, IN	I used a toriod kit from Toroid Corp of Maryland for my tube DAC transformer. I wound a 250 volt b+ winding and a hefty filament winding plus +-15 windings for both analog and digital power. It's an 80 va transformer which is 1.7" high and about 3.5" in diameter when finished. http://www.toroid.com/standard_trans...ormer_kits.htm And some info on what I did with the smallest kit: http://quadesl.com/pdf/trans_inst.pdf Sheldon