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Old 9th March 2007, 05:15 PM   #1
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Default 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.
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Old 9th March 2007, 06:38 PM   #2
zobsky is offline zobsky  India
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Perhaps this toroid (or something similar) would work (about 0.25 " too large)
http://cgi.ebay.com/460V-CT-230V-220...QQcmdZViewItem
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Old 10th March 2007, 12:35 AM   #3
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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
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Old 10th March 2007, 04:34 AM   #4
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Thanks, but it appears to be slightly too large.
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Old 10th March 2007, 08:53 AM   #5
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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
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Old 10th March 2007, 11:35 AM   #6
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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
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