hi-end Line filter

umut1001 · 26th June 2008, 11:48 AM

hi everybody..we want to make a hi-end diy line filter for tube amps and general purpose amps..we want no dc humm,hiss and buzz..here in our country electricty is 50hz and sometimes dirty..and also i dont want to hear any cracking sound from speaker when turning on and off the lights..i have a schematic..i did this pi filter but there is still a sound when turning on my drill

does anyone know about this subject ?thanks a lot

umut1001 · 27th June 2008, 08:24 AM

hi there..does anyone have an idea about it ? we need help

AndrewT · 27th June 2008, 08:39 AM

Hi,
that circuit is visually balanced but in reality is not balanced.
The safety of having the blocking caps in both Live and Neutral lines is reduced compared to having all the blocking in either the Live line or in the Neutral line.

It is better to have interference suppression fitted at source than to apply filters at the inputs to your equipment.
Ensure all you domestic equipment is properly suppressed.

umut1001 · 27th June 2008, 08:48 AM

hi andrew..thanks for your help..and i wanna ask something again..there is several mkps here in shops..

philips mkp X2 100n

arcatronics 100n

roederstein 100n

hitano 100n

i dont know about these capacitors..also i had wima mks but i think its not reliable for audio..which one should i buy ?or can you advice another one?it must be hi-end filter for expensive tube amps..

thanks a lot

richie00boy · 27th June 2008, 08:53 AM

The capacitors across live and neutral must be X or Y rated. This circuit is nothing to do with audio as it's connected to the power supply, the mains at that, so ignore audio caps.

AndrewT · 27th June 2008, 09:45 AM

Quote:

Originally posted by umut1001
philips mkp X2 100n

the philips X2 is rated for connection between Live and Neutral.
Do not use anything that is not rated for mains use.
Must be X rated for Live to Neutral.
Must be Y rated for Line (Live and/or Neutral) to Earth.

umut1001 · 27th June 2008, 10:52 AM

should i also connect one more 100n capacitor between live to earth(not neutral) ? like this picture

AndrewT · 27th June 2008, 11:26 AM

Quote:

Originally posted by umut1001
should i also connect one more 100n capacitor between live to earth(not neutral) ? like this picture

depends on what earth leakage you or your system can tolerate.

It is better to use two Yrated caps, one from Live to Earth and the other from Neutral to Earth.

jacco vermeulen · 27th June 2008, 11:36 AM

http://www.ibselectronics.com/pdf/pa...capacitors.pdf

umut1001 · 27th June 2008, 12:09 PM

hi..sorry but i dont know what is X and Y rated capacitors..is it a specification ? there is not wima Y capacitors here in my country

27th June 2008, 08:39 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, that circuit is visually balanced but in reality is not balanced. The safety of having the blocking caps in both Live and Neutral lines is reduced compared to having all the blocking in either the Live line or in the Neutral line. It is better to have interference suppression fitted at source than to apply filters at the inputs to your equipment. Ensure all you domestic equipment is properly suppressed. __________________ regards Andrew T.

27th June 2008, 08:53 AM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The capacitors across live and neutral must be X or Y rated. This circuit is nothing to do with audio as it's connected to the power supply, the mains at that, so ignore audio caps. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Which line filter is best?	Stu_M	Parts	51	15th June 2009 12:34 PM
60hz Line filter for PSU	triden	Power Supplies	3	25th November 2007 08:58 AM
line filter design.	AudioGeek	Power Supplies	3	9th April 2007 07:20 PM
Line Filter for Gainclone	Bassterror	Chip Amps	2	1st October 2006 11:23 AM
Need Help with EMI/RFI Line Filter	auric	Parts	10	29th August 2006 04:35 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

27th June 2008, 08:24 AM	#2
umut1001 diyAudio Member Join Date: Mar 2007 Location: Istanbul	hi there..does anyone have an idea about it ? we need help

27th June 2008, 08:48 AM	#4
umut1001 diyAudio Member Join Date: Mar 2007 Location: Istanbul	hi andrew..thanks for your help..and i wanna ask something again..there is several mkps here in shops.. philips mkp X2 100n arcatronics 100n roederstein 100n hitano 100n i dont know about these capacitors..also i had wima mks but i think its not reliable for audio..which one should i buy ?or can you advice another one?it must be hi-end filter for expensive tube amps.. thanks a lot

27th June 2008, 11:36 AM	#9
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	http://www.ibselectronics.com/pdf/pa...capacitors.pdf

27th June 2008, 12:09 PM	#10
umut1001 diyAudio Member Join Date: Mar 2007 Location: Istanbul	hi..sorry but i dont know what is X and Y rated capacitors..is it a specification ? there is not wima Y capacitors here in my country

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)