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Old 5th September 2006, 07:42 AM   #1
groov is offline groov  United States
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Default toroids for mains transformer

Could any one please give me a hint of what kind of toroid core (material, size OD, ID) is required to build a mains transformer with .5 to 1KVA spec?

I have research it on the web and found some info from several sources however none of it tells me which type of toroidal core should I use for this type of application.

Thanks in advance
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Old 5th September 2006, 11:42 AM   #2
AndrewT is online now AndrewT  Scotland
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Hi,
are you planning to buy in the strip metal to wind your own core?
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Old 5th September 2006, 04:17 PM   #3
groov is offline groov  United States
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Please enlighten me, what do you mean by strip metal?

I was planning to use regular insulated copper (magnet) wire probably awg 14 size.

Thanks
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Old 5th September 2006, 04:21 PM   #4
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He thinks you intend to make you own core.

Why do you want to wind a toroidal transformer? You can probably find one surplus or even retail that is close enough to your needs. They difficult to wind and you need a special bobbin at least.
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Old 5th September 2006, 05:13 PM   #5
groov is offline groov  United States
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Yes, that is the plan to wind my own coils. Because I can adjust the secondary for the required VA and secondly I would like to build several power amps and the mains transformers are quite expensive.

About 35 years ago I use to wind toroids for a living while attending EE school but at the time it was only a job to put me through school not paying much attention to the details specs for these monsters. So winding a toroid I do not see it as a hugh task what I would like to know is if anybody has an insight on which kind of toroids (material, size, permeability, etc) are used for these monsters.

Thanks
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Old 6th September 2006, 08:04 AM   #6
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i'll pay a 1.2KVA 50+50Vac toroidal transformer about 140€, it's competitive to build it yourself? i think no...
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Old 6th September 2006, 12:30 PM   #7
AndrewT is online now AndrewT  Scotland
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Hi,
buy a secondhand 1.2kVA 45Vac +45Vac for 60euros and add some windings to convert it to 50+50. That's cheaper.
Then add a 10V winding for relay supply then add 8v +8V for the regulated front end supply then .....
Try to buy that new for 140euros.
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Old 6th September 2006, 01:19 PM   #8
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www.toroidy.pl

500VA for $40 / 30 Euro + shipping
1500VA for $110 / 85 Euro + shipping.
see Peter Daniel's post on the ZV9 thread
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Old 6th September 2006, 01:22 PM   #9
AndrewT is online now AndrewT  Scotland
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Hi,
that is PRICING on the basis of cost input and not on what the market will bear.
More to his business.
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