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Mains filter: John Risch
Mains filter: John Risch
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Old 21st April 2017, 06:18 AM   #1
noviygera is offline noviygera  United States
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Default Mains filter: John Risch

Looking for advice on the best simple filter to built into my power strip for my audio equipment -- for each outlet. I see two options -- which is better for US voltage?

John Risch filter or Lampizator Silk?

AC filter by Lukasz F.

thanks,
Herman
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Old 21st April 2017, 10:10 AM   #2
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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Switching the protective earth out is positively dangerous!
What a load of rubbish, the "burn in" time on an extra load.
Most audio equipment that conforms to modern standards has enough filtering in the power supply not to require loads of chokes and capacitors that will make a PAT test fail.
I do not recommend this filter by AC filter by Lukasz F. at all. There is no requirement for filters.
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Old 21st April 2017, 10:32 AM   #3
sumotan is offline sumotan  Indonesia
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I second Jon's comment on Lukasz filter but I did build the original
Risch filter, it does really work very well but one has to use a 100w incandescent
bulb to load the filter which is really not that practical

Cheers
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Old 21st April 2017, 10:59 AM   #4
DF96 is offline DF96  England
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The Lampizator filter contains several errors - including the silly idea that a mains filter needs burning in.

C1 must be X-rated.
C2 and C3 (referred to as C3 and C4 in the text) must be Y-rated.
His chokes are probably too low in inductance to stop anything part from some RF noise.
The ground switch and inductor L4 must be omitted - just use a thick wire.
Include a fuse before C1 - even X-caps can sometimes fail.

Better still, if you need a mains filter why not buy one which has been designed and built by a real engineer to do a real job?
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Old 21st April 2017, 11:02 AM   #5
sumotan is offline sumotan  Indonesia
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And yet there's rave reviews on his diy as well as products. Lol
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Old 21st April 2017, 11:24 AM   #6
DF96 is offline DF96  England
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That just goes to show the poor state of science teaching in our schools.
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Old 21st April 2017, 11:32 AM   #7
sumotan is offline sumotan  Indonesia
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In a way but part to blame are the students too. Lol
Think a balance line xformer would do a much better
job especially for light loaded equipment. This is my
next thing to try. Not sure if it would help cause
my audio main lines are separately runned individually
straight from the breaker box & the earth wire is directly
connected to a 3 meter copper rod thats buried into the
ground.

Cheers
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Old 21st April 2017, 11:47 AM   #8
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by sumotan View Post
the earth wire is directly
connected to a 3 meter copper rod thats buried into the
ground.

Cheers
If that's for safety it might not be wise
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Old 21st April 2017, 11:53 AM   #9
sumotan is offline sumotan  Indonesia
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No safety is at the breaker. Thats for noise how, then you've
got to do a little research on this

Cheers
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Old 21st April 2017, 01:25 PM   #10
scottjoplin is offline scottjoplin  Wales
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I hope you aren't trying to confuse me.....
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