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Old 3rd October 2012, 08:26 AM   #101
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HEY,
Can anyone please tell me what is the formula for finding priamary and secondory turns for a small ferrite core transformer where 220vac will be the input of priamary side and 12vac will be the output of secondory side...or can we use the EP/ES=NP/NS formula??

please help me...
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Old 3rd October 2012, 10:45 AM   #102
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@Shams, posting in all caps is against forum rules....please do not do it again...
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Old 3rd October 2012, 10:56 AM   #103
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re: EP/ES=NP/NS
This formula won't provide the number of turns, only the turns ratio.
Determining the actual number of turns is much more involved - physically counting them or heady calculations from wire size.
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Old 3rd October 2012, 11:09 AM   #104
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Quote:
Originally Posted by shams View Post
HEY,
Can anyone please tell me what is the formula for finding priamary and secondory turns for a small ferrite core transformer where 220vac will be the input of priamary side and 12vac will be the output of secondory side...or can we use the EP/ES=NP/NS formula??

please help me...
ferrite core, means you are looking at smps, out of scope of this thread...
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Old 3rd October 2012, 03:34 PM   #105
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so friends....what should i do please tell me how will i got to know about the ferrite core transformer,the priamary & secondory turns...everything!! related to it......
pleaseeeeee help its very very urgent!!
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Old 3rd October 2012, 04:10 PM   #106
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This thread covers a lot of the basics of transformers'

Step-up transformer design

It is a long thread but as lots of very good info as it explains basics of core saturation and how to go about finding such parameters.
As well as finding the turns count of the windings and ratio of a unknown transformer.

Here is a link to a calculator that might help you.

Step-up transformer design

This one is a good one as well but I think it assumes a square wave input and I have not tried raw calculations to check it yet,

TRANSFORMERS

You need to know the core size and type of material in order to determine the number of primary turns as per frequency and primary voltage in order to design it for no saturation of the core.

There many good threads on transformer design in this forum but I don't have a compiled list for them as they can be found very easily using the search function.

Here is the calculator that I think you are looking for and it also shows the formulas as well,

Maximum Flux Density Calculator

There a few more transformer calculators that can be found on this page,

http://www.daycounter.com/SiteMap.phtml

I hope this helps you !!


jer

Last edited by geraldfryjr; 3rd October 2012 at 04:19 PM.
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Old 3rd October 2012, 06:06 PM   #107
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Hi, something new here

Back on iron trafo...
I think I must finish my trafo build as soon as possible...
But I'm not sure yet
maybe I'll show what I've been done so far
I will need suggestion, to continue or start over
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Old 3rd October 2012, 07:43 PM   #108
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rikkit,
do you have any further info on that pdf file
not getting any hits for that either google or texas instruments
thanks
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Old 4th October 2012, 05:17 AM   #109
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Default I think this is not good

This will be 300VA trafo that I'm going to make or maybe not.
I'm just not so confidence is this okay or not
I thing ask some suggestion here is a good way
I just use what I see around he..he... ,
latter
I found better "things" to use as
inter layer windings insulation
also found good trafo as a reference

here 2 pictures
what do you think, give it a try or
I must start again with better way?

Any comment greatly appreciated
Attached Images
File Type: jpg Base.jpg (103.5 KB, 77 views)
File Type: jpg Primary almost done.jpg (129.7 KB, 71 views)
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Old 4th October 2012, 07:00 AM   #110
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^yeah, why not? if i were you i'd make a wooden mandrel with which to put the bobbin into, this way you can pound on the windings using wooden mallet or a bench vise to make sure your built up coil fits the iron core....
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