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Old 5th December 2009, 11:48 AM   #1
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Default My transformer

I have attached bridge and caps on the transformer as u can see. Is that ok???????/
The second single cap bridge is 12volt dc for indicator and decorating lights additional feature of transformer???/ i powerd up tda2030a and tda burnt with snoke in 2 sec. is this power transformer ok for lm3886 or there is chances of burning? i hav 8 ohm 6 inch woofer.
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Old 5th December 2009, 12:43 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
measure the DC output voltage at the rectifier/smoothing cap.

How small/big is that EI transformer.
I see 25+25V and 3A. But, it does not look like 150VA. It looks more like a 20VA to 50VA transformer.
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Old 5th December 2009, 01:34 PM   #3
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Quote:
Originally Posted by AndrewT View Post
Hi,
measure the DC output voltage at the rectifier/smoothing cap.

How small/big is that EI transformer.
I see 25+25V and 3A. But, it does not look like 150VA. It looks more like a 20VA to 50VA transformer.
u mean its not 3A transformer. i ask the same question from the maker of this transformer and he told me that the size of the transformer depend on the core and winding. it is 3a transformer. but y u say that its look like 20 to 50 va??? this transformer cost me $4

Last edited by livenicely; 5th December 2009 at 01:40 PM.
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Old 5th December 2009, 01:48 PM   #4
AndrewT is offline AndrewT  Scotland
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how big is the transformer?
Length =
width =
height =
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Old 5th December 2009, 02:00 PM   #5
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it is
height of core 6 cm
lenght of core 7.5 cm
width of core 3.5cm

i m now really worried.
i can send u high resolution pics
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Old 5th December 2009, 02:19 PM   #6
AndrewT is offline AndrewT  Scotland
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I estimate from the pics and the sizes that the winding aperture is ~36mmx13.5mm, ~4.9sq cm ~0.75sq in and the centre leg of the core is ~24mmx34mm.
This gives the core area of ~ 1.25sq in =~8sq cm

Can anyone tell us the VA rating for these areas?

What is the diameter of the secondary wire?
What is the diameter of the primary wire?
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Old 5th December 2009, 02:24 PM   #7
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sorry i cant tell u this. leave it. thank u so much but just tell me i did this wrong i mean attached caps an bridge direct on transformer or it is ok. i can closed this transformer in side a box or i need to make a proper pcb for bridge
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Old 5th December 2009, 02:31 PM   #8
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by AndrewT View Post
Hi,
measure the DC output voltage at the rectifier/smoothing cap.
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regards Andrew T.
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Old 5th December 2009, 04:51 PM   #9
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by AndrewT View Post
Can anyone tell us the VA rating for these areas?
About 64VA if the iron is of a good quality. By the look of it, I'd rather say ~50VA.
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Old 5th December 2009, 06:47 PM   #10
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About 64VA if the iron is of a good quality. By the look of it, I'd rather say ~50VA.
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