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pinnocchio		#1 Posted : Monday, January 17, 2011 1:03:42 PM(UTC)
Rank: Member Groups: Member Joined: 11/3/2010(UTC) Posts: 169 Location: Quebec		Hi, I just finished building and adjusting one of my Placid BP and set for 250mA with +/- 15V My toroid is a 15V 25VA The placid heatsinks near the DC out panel are getting close to 70 Celcius (158 F) without any load attached to the placid. Is this normal? Should I have bought 12V 25VA instead? Thanks Do
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Russ White		#2 Posted : Monday, January 17, 2011 1:21:19 PM(UTC)
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)		That is normal, because you shunt is shunting all the current that would normally be used by your load.
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pinnocchio		#3 Posted : Monday, January 17, 2011 1:28:25 PM(UTC)
Rank: Member Groups: Member Joined: 11/3/2010(UTC) Posts: 169 Location: Quebec		I have connected my IVY III to the Placid BP and measured the voltage to make sure it was not sagging and I noticed that the +15V rail stays perfectly the same but my -15V rail drops to -4.8V. I have 253mV on the +Rail and -252mV on the -Rail Thanks Do
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Russ White		#4 Posted : Monday, January 17, 2011 1:37:06 PM(UTC)
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)		Adjust the negative rail until it does not sag. If this is version 2.1.2 you can also check R13 and R14 while loaded to see what you are actually shunting with the load connected.
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pinnocchio		#5 Posted : Monday, January 17, 2011 1:57:41 PM(UTC)
Rank: Member Groups: Member Joined: 11/3/2010(UTC) Posts: 169 Location: Quebec		I have adjusted while fully loaded. It is now stable at -15V. Is 250mA per rail enough to power the whole IVY III? Could having +15V and -4.80V caused damage to the IVY? I have not tested it yet that's why I'm asking. Last question... If I take a 15V toroid to power the Buffalo II, will it work with the Placid or is it asking too much to go from +/- 23v DC to 5.5v DC ? Thanks Do
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Russ White		#6 Posted : Monday, January 17, 2011 2:52:13 PM(UTC)
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)		That 15V trafo would create big drop, it would run really hot. I would not recommend that. If the Placid-BP is holding at 15V you should be fine. Just measure the IVY outputs prior to actually using it.
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pinnocchio		#7 Posted : Monday, January 17, 2011 3:12:55 PM(UTC)
Rank: Member Groups: Member Joined: 11/3/2010(UTC) Posts: 169 Location: Quebec		Hi Russ, Everything seems to have drop at a stable 14.77 volts on both rails. The only issue is heat. It is still at 65c (150F) Should I change to higher heatsinks or will it survive a long time at this temperature? Thanks Do
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Brian Donegan		#8 Posted : Monday, January 17, 2011 3:15:19 PM(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)		That temp is not bad. Is it attached to a load with those temps?
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pinnocchio		#9 Posted : Monday, January 17, 2011 3:30:05 PM(UTC)
Rank: Member Groups: Member Joined: 11/3/2010(UTC) Posts: 169 Location: Quebec		Hi Brian, It is attached to the IVY III Thanks Do
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