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Joined: 8/20/2014(UTC) Posts: 43 
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Hello,
i am arguing why 9V power transformers are suggested to feed Placid HD power supply for Buffalo III boards.
Wouldn't it be better to use a lower voltage transformer, like a 7V one? Placid HD regulator would get 7V x 1,4 = 9,8V rectified current, that should be enough for outputting 5,25V... am i wrong? A 6V transformer should be enough too...
By increasing transformer voltage we have more power to dissipate, causing the heat to increase too.
There is a specific reason to use 9V transformers instead of 7V or lower?
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Rank: Administration
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Joined: 10/24/2006(UTC)
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Technically all of those should work OK, the little bit extra headroom for regulator does help a bit in terms of performance at the cost of a somewhat less efficiency. :) Still anything from 6-9V or so would be fine.
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Rank: Member
Groups: Member
Joined: 8/20/2014(UTC) Posts: 43
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Thank you for your answer.
You mean using 9V instead of 7V would make regulator output more stable? Or less subject to ripple/noise?
I can stand the less efficiency if performance would be better..
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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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Yes - you will get slightly better regulation with 9V instead of 7V just because the CCS will have a bit more headroom. This difference is not at all huge - but still there is no advantage to the smaller voltage. :)
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Rank: Member
Groups: Member
Joined: 8/20/2014(UTC) Posts: 43
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You're right, i forgot Placid HD is a shunt power supply.
Thank you again and Happy New Year!
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