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Old 13th October 2003, 09:12 PM   #1
MaXiZ is offline MaXiZ  Italy
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Question Enough Voltage but not Ampère...

Why?
I've winded a transformer different times and never get more that 2-3A. It were a PC Power Supply of 350W. It's a classic transformer not a Torroidal...
I reach +/-35V but the A is too low for my amplifier..
What's maybe the reasons?
I'we winded by this way.. ====== Is isolation
============
Secondary 2
============
Primary 2
============
Secondary 1
============
Primary 1

CORE


Is it winded in the wrong way? How should it winded? Or do u think that i should consider to pick another transformer???
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Old 14th October 2003, 05:54 AM   #2
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Is there some trick to to for increase the current?
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Old 14th October 2003, 06:29 AM   #3
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If you're trying to rewind a ferrite core transformer from a switched PSU to function as a regular 50Hz mains transformer, my advice is definitely to stop. It's not supposed to work at that frequency, and you're dealing with deadly voltages here!

Rune
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Old 14th October 2003, 07:48 AM   #4
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He is trying to use it as a SMPSU...but I think his input current is definetly not enough...from the previous posts that he had...
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Old 14th October 2003, 01:41 PM   #5
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What are the dimensions of the core (cross-section area of the middle), what is the secondary wire diameter, do you use EI transformer with or without air gap?
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Old 14th October 2003, 02:03 PM   #6
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He does have some previous posts on his SMPSU right here...
SMPS problem
There's a picture of it there...shows a PC EI core got scrapped for his trafo...
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Old 14th October 2003, 05:55 PM   #7
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Quote:
but I think his input current is definetly not enough
Now i use a car battery with 20A!
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Old 15th October 2003, 06:08 AM   #8
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Hmmm...and what current can you pump out from the other side??
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Old 15th October 2003, 06:17 PM   #9
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Quote:
other side
??????????
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Old 15th October 2003, 08:25 PM   #10
MaXiZ is offline MaXiZ  Italy
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Now with a chargedcar battery (i don't know ho many current produced but a lot i think! ) i've +/-36V@7.5A!!
Enough no???
thanx to all the ppl that gave an help to me!
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