Enough Voltage but not Ampère...

MaXiZ · 13th October 2003, 10:12 PM

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???

MaXiZ · 14th October 2003, 06:54 AM

Is there some trick to to for increase the current?

runebivrin · 14th October 2003, 07:29 AM

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

li_gangyi · 14th October 2003, 08:48 AM

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...

PMA · 14th October 2003, 02:41 PM

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?

li_gangyi · 14th October 2003, 03:03 PM

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...

MaXiZ · 14th October 2003, 06:55 PM

Quote:

but I think his input current is definetly not enough

Now i use a car battery with 20A!

li_gangyi · 15th October 2003, 07:08 AM

Hmmm...and what current can you pump out from the other side??

MaXiZ · 15th October 2003, 07:17 PM

Quote:

other side

??????????

MaXiZ · 15th October 2003, 09:25 PM

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!

13th October 2003, 10:12 PM	#1
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	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???

14th October 2003, 07:29 AM	#3
runebivrin diyAudio Member Join Date: Jul 2003 Location: Huddinge, Sweden	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 __________________ Do wizards use spell checkers?

14th October 2003, 08:48 AM	#4
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	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... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

14th October 2003, 03:03 PM	#6
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	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... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

15th October 2003, 07:08 AM	#8
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	Hmmm...and what current can you pump out from the other side?? __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...


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14th October 2003, 06:54 AM	#2
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	Is there some trick to to for increase the current?

14th October 2003, 02:41 PM	#5
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	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?

15th October 2003, 09:25 PM	#10
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	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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