Transformer Question

toufu · 19th January 2011, 08:35 PM

If a construction asks for 4x9v AC. Could I just use a single 9v transformer if the wattage is big enough to supply all 4 AC input? Thanks.

tomchr · 19th January 2011, 08:43 PM

Depends. If you show a schematic, we could find out...

~Tom

db! · 19th January 2011, 09:15 PM

You should be able to unless the supplies needs to be isolated from each other. When you 4x9V, do you mean four 9V taps on a single transformer or four 9V transformers?

toufu · 19th January 2011, 09:33 PM

Is there a difference between four taps on a single transformer or four 9v transformers?

Anyways, I am trying to build Oliver's TDA1541 DAC, it asks for 3x12V AC at 1amp each. Can I just get a 50VA single 12V transformer to feed all three?

Thanks for the quick reply.

db! · 19th January 2011, 09:44 PM

Quote:

Originally Posted by toufu

Is there a difference between four taps on a single transformer or four 9v transformers?

Anyways, I am trying to build Oliver's TDA1541 DAC, it asks for 3x12V AC at 1amp each. Can I just get a 50VA single 12V transformer to feed all three?

Thanks for the quick reply.

From what I understand, a separate power source/transformer should provide "cleaner power" since there is no crossover interference(I think that's the tech term). Depending on the sensitivity of your circuit, you may be able to get away with a multi-tap transformer...

Is this the project you were looking at?: My take to the "Reference" TDA1541A DAC with I2S-BUS architecture

If so, you will need isolated supplies...

toufu · 19th January 2011, 09:45 PM

Yep, that's the project.

19th January 2011, 08:35 PM	#1
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Transformer Question If a construction asks for 4x9v AC. Could I just use a single 9v transformer if the wattage is big enough to supply all 4 AC input? Thanks.

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19th January 2011, 08:43 PM	#2
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	Depends. If you show a schematic, we could find out... ~Tom

19th January 2011, 09:15 PM	#3
db! diyAudio Member Join Date: Nov 2009 Location: Ontario	You should be able to unless the supplies needs to be isolated from each other. When you 4x9V, do you mean four 9V taps on a single transformer or four 9V transformers?

19th January 2011, 09:33 PM	#4
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Is there a difference between four taps on a single transformer or four 9v transformers? Anyways, I am trying to build Oliver's TDA1541 DAC, it asks for 3x12V AC at 1amp each. Can I just get a 50VA single 12V transformer to feed all three? Thanks for the quick reply.

19th January 2011, 09:45 PM	#6
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Yep, that's the project.