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hkminn		#1 Posted : Wednesday, February 15, 2012 4:01:28 AM(UTC)
Rank: Member Groups: Member Joined: 3/9/2009(UTC) Posts: 65 Location: seoul, korea		Hello, I have Buffalo24 connected to a LCDPS. I adjusted DV to 6V, AV to 6.6V with DAC disconnected. When I connect DAC, the DV drops to 3.8v while AV stays at 6.6V. Is this normal? Thank you.
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steinholien		#2 Posted : Wednesday, February 15, 2012 6:13:17 AM(UTC)
Rank: Advanced Member Groups: Member Joined: 6/12/2008(UTC) Posts: 79 Location: Norway		Thats not how it should be. Could be that either the VD draws to much current or that your transformer is to small. What VA transformer do you use?
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Brian Donegan		#3 Posted : Wednesday, February 15, 2012 7:52:06 AM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		What are the values of the power resistors on the LCDPS?
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hkminn		#4 Posted : Wednesday, February 15, 2012 8:45:03 AM(UTC)
Rank: Member Groups: Member Joined: 3/9/2009(UTC) Posts: 65 Location: seoul, korea		Thank you steinholien, It must be the transformer. I am using 10VA transformer with 2 9v tabs. I use one tab for DV and the other for AV. I thought 5VA would be enough, but obviously not. I will try with a different transformer. Thank you
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hkminn		#5 Posted : Wednesday, February 15, 2012 8:55:21 AM(UTC)
Rank: Member Groups: Member Joined: 3/9/2009(UTC) Posts: 65 Location: seoul, korea		Brian Donegan wrote: What are the values of the power resistors on the LCDPS? They are 10R 3w. I replace the transformer with 15VA, and DV drops to 4.6V., but AV stays the same, 6.6V Needs larger transformer? Thank you Edited by user Wednesday, February 15, 2012 8:58:28 AM(UTC)  | Reason: Not specified
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steinholien		#6 Posted : Wednesday, February 15, 2012 10:50:22 AM(UTC)
Rank: Advanced Member Groups: Member Joined: 6/12/2008(UTC) Posts: 79 Location: Norway		Try to replace the power resistors with something smaller. They limit the current in to the PSU. Something like 0-3 ohm should be ok. A 10VA transformer should work.
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