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4hv.org :: Forums :: Sale and Trade
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Group Buy: 0F43825TC cores

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Ben Solon
Wed Sept 11 2013, 12:54AM
Ben Solon Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
Andy wrote ...

Hi ben123324

If I was going to make a 2* 1kw transformer how many of the cores would I need. I might be interested.

It all depends on your frequency, bridge voltage, and how far you want to push them. To use mine as an example, 35khz is the lowest frequency I'll drive at, so:

turns=(340 volts/35 khz)/((10*97.5mm^2)*.3 tesla)
turns=16.6

and if I where to up my drive voltage:

turns=(340 volts/35 khz)/((10*97.5mm^2)*.3 tesla)
turns=33.2

The 10 by the Ae value represents that I have the cross section of 10 cores to work with, as that's how many I can fit on my pipe.
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Andy
Wed Sept 11 2013, 01:08AM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
I'll take 25 then if thats allright, how much do you think postage will come to, what country do you live in?
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Ben Solon
Wed Sept 11 2013, 01:12AM
Ben Solon Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
Andy wrote ...

I'll take 25 then, how much do you think postage will come to, what country do you live in?


I'm in the US, from experience shipping varies greatly by weight(light box maybe 10usd). To get an accurate answer I'd have to stuff a box with the estimated weight and take it to the PO.
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Andy
Wed Sept 11 2013, 01:13AM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
10usd is a good bench mark
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Ben Solon
Wed Sept 11 2013, 01:16AM
Ben Solon Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
75/50 cores! 25 more and the price per core drops from 1.41usd to 1.27usd.


Andy wrote ...

10usd is a good bench mark

Can you give me a country so I can get you a better estimate? the cores themselves weigh 2.275lbs(25), but I won't know where to start if I don't have a city and postal code.
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Ben Solon
Sun Sept 15 2013, 03:01AM
Ben Solon Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
All right, so the cores are being ordered, and the cost of your specific order is:

(1.41*coreQuantity)+(shippingToYou)+(30/5)

coreQuantity = # of cores you ordered
shippingToYou = 10usd if you're in the US, 40usd if you're not
the 30/5 is the dexter shipping charge / the number of us

My paypal is **link**, pm me if you have any questions. I'll keep you updated as to the status.
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