trafo..

samsagaz · 30th August 2004, 02:47 PM

hey guys, i ll receive tomorrow my lm4780 and lm3886 chips, ill goto buy 2 power suply today, an normal and try to find an toroidal ... too.

im looking into both datasheets and i see that the power that i need will be <= 80v.

the question that i want to ask is... is ok an power supply with the primary 220v and secundary +80v?

is ok too primary 220v and secundary -40 and +40 ?

sorry for the dumb question

thanks..

pinkmouse · 30th August 2004, 03:09 PM

I would go for one of about 200 to 300VA with 25-0-25 rails, but if you do a little work and have a look thorough some of the other threads then you will find more than enough info on the best choice for your application.

samsagaz · 30th August 2004, 03:28 PM

well i found some post that say that -25/0/+25 is the best choise....

what abt the amps?

how many ampers?

and latest question... if i ll use bridged chips, is ok to use the same power supply?

carlosfm · 30th August 2004, 04:17 PM

To open this thread you had to select the option "Have you searched? ".
You lied.

samsagaz · 30th August 2004, 05:13 PM

no dude, i searched, but i dont understand 100% the posts... ppl say diferent things and the posts talk more than just the simple question....

i searched abt ampers without lucky

Peter Daniel · 30th August 2004, 05:19 PM

6 - 8 A should be fine. You can go even less if cost an issue.

cowanrg · 30th August 2004, 05:26 PM

people are suggesting a 300VA xformer... that means:

25V + 25V = 50V
300VA/50V = 6A

or, you can go the other way.

25V + 25V = 50V
50V * 6A = 300VA.

there you go. now you can figure it out in the future.

samsagaz · 30th August 2004, 05:42 PM

thx guys...

samsagaz · 30th August 2004, 06:04 PM

cant found toroidal power supply in my country

i can get an 25+25 normal power supply

it will be ok?

it cost me like 50 U$S

samsagaz · 30th August 2004, 06:06 PM

btw, when i asked for the power supply they told me that its an 300watts suply, is that ok?

30th August 2004, 02:47 PM	#1
samsagaz diyAudio Member Join Date: Aug 2004 Location: Argentina	trafo.. hey guys, i ll receive tomorrow my lm4780 and lm3886 chips, ill goto buy 2 power suply today, an normal and try to find an toroidal ... too. im looking into both datasheets and i see that the power that i need will be <= 80v. the question that i want to ask is... is ok an power supply with the primary 220v and secundary +80v? is ok too primary 220v and secundary -40 and +40 ? sorry for the dumb question thanks..

30th August 2004, 03:09 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I would go for one of about 200 to 300VA with 25-0-25 rails, but if you do a little work and have a look thorough some of the other threads then you will find more than enough info on the best choice for your application. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

30th August 2004, 05:19 PM	#6
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	6 - 8 A should be fine. You can go even less if cost an issue. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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30th August 2004, 03:28 PM	#3
samsagaz diyAudio Member Join Date: Aug 2004 Location: Argentina	well i found some post that say that -25/0/+25 is the best choise.... what abt the amps? how many ampers? and latest question... if i ll use bridged chips, is ok to use the same power supply?

30th August 2004, 04:17 PM	#4
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	To open this thread you had to select the option "Have you searched? ". You lied.

30th August 2004, 05:13 PM	#5
samsagaz diyAudio Member Join Date: Aug 2004 Location: Argentina	no dude, i searched, but i dont understand 100% the posts... ppl say diferent things and the posts talk more than just the simple question.... i searched abt ampers without lucky

30th August 2004, 05:26 PM	#7
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	people are suggesting a 300VA xformer... that means: 25V + 25V = 50V 300VA/50V = 6A or, you can go the other way. 25V + 25V = 50V 50V * 6A = 300VA. there you go. now you can figure it out in the future.

30th August 2004, 05:42 PM	#8
samsagaz diyAudio Member Join Date: Aug 2004 Location: Argentina	thx guys...

30th August 2004, 06:04 PM	#9
samsagaz diyAudio Member Join Date: Aug 2004 Location: Argentina	cant found toroidal power supply in my country i can get an 25+25 normal power supply it will be ok? it cost me like 50 U$S

30th August 2004, 06:06 PM	#10
samsagaz diyAudio Member Join Date: Aug 2004 Location: Argentina	btw, when i asked for the power supply they told me that its an 300watts suply, is that ok?

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