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milund		#1 Posted : Tuesday, June 7, 2011 1:44:53 AM(UTC)
Rank: Member Groups: Member Joined: 2/14/2011(UTC) Posts: 4 Location: Denmark		Hi, Besides from being totally overkill, will it hurt anything to increase t he capacitance before regulation to something big, like 22000uF or 47000uF pr. cap? best regards, Michael
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Brian Donegan		#2 Posted : Tuesday, June 7, 2011 4:52:06 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)		Additional capacitance before the supply is fine. Additional capacitance after the supply, not so good.
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toast		#3 Posted : Tuesday, June 7, 2011 7:33:47 AM(UTC)
Rank: Advanced Member Groups: Member Joined: 3/31/2011(UTC) Posts: 45 Location: Malaysia		Brian Donegan wrote: Additional capacitance before the supply is fine. Additional capacitance after the supply, not so good. Any reason?
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Brian Donegan		#4 Posted : Tuesday, June 7, 2011 8:13:50 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)		Generally speaking, shunt regulators don't like to see a highly capacitive load.
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christensenleif@msn.com		#5 Posted : Tuesday, June 7, 2011 11:40:00 AM(UTC)
Rank: Member Groups: Member Joined: 11/21/2008(UTC) Posts: 314 Location: Norway		so the way to do it is to increase the onboard 1000µF electrolytics? best Leif
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Brian Donegan		#6 Posted : Tuesday, June 7, 2011 12:36:31 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)		Yup. You will note that the HD version of the Placids use a 10000uF cap.
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milund		#7 Posted : Tuesday, June 7, 2011 12:45:18 PM(UTC)
Rank: Member Groups: Member Joined: 2/14/2011(UTC) Posts: 4 Location: Denmark		I layman terms (I think :-)): The output of a shunt regulator is supposed to be fast, which could be counteracted by a large capacitor, which takes time to 'fill up' or 'drain' - in severe cases instability and/or smoke might arise. I just wantet to make sure that a larger capacitor before the regulator did not have a similar effect. Thanks for the answer.
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Russ White		#8 Posted : Tuesday, June 7, 2011 8:52:49 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)		No, they are not the same scenario at all.
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sureshm		#9 Posted : Tuesday, June 7, 2011 11:44:37 PM(UTC)
Rank: Member Groups: Member Joined: 9/2/2008(UTC) Posts: 53 Location: Sydney, Australia		What the minimum voltage drop that is required for the placid to operate effectively. For example, if you have 10.5v after rectification and smoothing, what is the maximum voltage the placid would be able to supply/regulate.
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