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Calculating / measuring VA on an existing transformer
Rank: Member
Groups: Member
Joined: 6/20/2010(UTC) Posts: 28 Location: Germany
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Hello to all,
I bought a Buffalo II board with Ballsie + the PSU´s needed,
but those are not intended for a DIY-Project in a clasical way,
but for upgrading a CD-Player from the
eighties.
Now, after tossing out the original D/A Board,
there will be plenty of room for modding.
But I do not like the idea of putting extra toroids somewhere deeper in
the player´s cabinet and run a mains power cable halfway through the player for feeding them.
The original D/A-board runs on +/- 15V and will probably draw
a lot more current from the player´s transformer than the Balsie.
So I can take the original transformer´s for the Balsie`s PSU.
Also the secondaries for the players main board (+5/-5V running on a +11/-11 V Reference voltage) could be used,
but here the problem starts:
There is no data in the player´s datasheet and circuitry, how much VA the
secondaries for the main board can provide and how much current is consumed by the main board´s circuitry.
Also no label on the Transformer. The total consumption is 25W, but the player´s transformer has 4 secondaries,
two of them for supplying positive/negative voltages.
How can I measure the power consumtion of the mains board AND how much current the secondaries
of the orinal transformer can provide? And can I attach two PSU to one secondary, or will they interfere?
Thanks for your help,
Nak
Edited by user Tuesday, June 22, 2010 11:51:07 AM(UTC)
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Rank: Administration
Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN
Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)
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Hi Nak,
Regarding measurement I don't have a good answer for you but perhaps a little google searching may yield some better results.
Short answer is just to give it a go. If your power supplies are not sagging with the current transformer than I would just use it and not worry. There should be no harm in trying it.
Cheers! Russ
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Twisted Pear Audio Support
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Calculating / measuring VA on an existing transformer
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