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Old 4th July 2003, 02:44 PM   #1
JayV is offline JayV  Sweden
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Question diy transformator

Anyone got info on building transformators? Ei-core should be pretty easy to make the core for. But R-core seems to be much better!
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Old 4th July 2003, 05:43 PM   #2
JayV is offline JayV  Sweden
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Default calculations

i just made some calculations with a program i found:
http://www.hw.cz/software/transforn_...ansformer.html

The results seem not to hard to build from:
70*70mm core
1*231 coils primary with 2,16(2,5) mm wire
2*38 coils secondary with 3,5 mm wire

the output is 2*38V & 25A (1900VA) and should be just fine for one aleph 2

Can this numbers be correct? I belived it would take more turns for some reason..
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Old 4th July 2003, 08:54 PM   #3
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If you start with a mains of 230V AC and 231 turns, you get 1 V AC per turn. Secondary of 38 turns gives you .... 38V AC. Seems a perfect fit to me.

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Old 4th July 2003, 09:38 PM   #4
JayV is offline JayV  Sweden
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Yes i know, but if you take for example 231*4=924 and 38*4=152 turns. Does it any difference in efficiency??
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Old 4th July 2003, 10:15 PM   #5
AJT is offline AJT  Philippines
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your primary turns at 231 is not bad you'd use more copper though, my calculation for that size of core is 160turns, what this implies is that you will end up with a lower magnetizing current and maybe lower core loss, trade off being, higher copper losses since you'll be using more copper....best efficiency if obtained when core losses equals copper losses, pretty much textbook stuff!!!
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Old 8th July 2003, 12:19 AM   #6
JayV is offline JayV  Sweden
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Default ei-core laminates

Where can i buy ei laminates in europe?
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