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Old 19th January 2011, 08:35 PM   #1
toufu is offline toufu  United States
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Default 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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Old 19th January 2011, 08:43 PM   #2
tomchr is offline tomchr  United States
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Depends. If you show a schematic, we could find out...

~Tom
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Old 19th January 2011, 09:15 PM   #3
db! is offline db!  Canada
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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?
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Old 19th January 2011, 09:33 PM   #4
toufu is offline toufu  United States
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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.
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Old 19th January 2011, 09:44 PM   #5
db! is offline db!  Canada
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Quote:
Originally Posted by toufu View Post
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...
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Old 19th January 2011, 09:45 PM   #6
toufu is offline toufu  United States
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Yep, that's the project.
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