Variations of DC Main Filter against buzzing Toroid Transformers - what is the right? - Page 9 - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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
Reply
 
Thread Tools Search this Thread
Old 6th October 2011, 07:41 AM   #81
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by tiefbassuebertr View Post
(or are really all circuits equally good as AndrewT has mentioned anywhere) ?
Lies and damned lies.
That is your misguided interpretation of something I did not post.

There are many poorly functioning or plain bad attempts at showing/building DC blockers for mains power. I have criticised a few of them when needed.
__________________
regards Andrew T.
  Reply With Quote
Old 6th October 2011, 09:14 AM   #82
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by AndrewT View Post
Lies and damned lies.
That is your misguided interpretation of something I did not post.

There are many poorly functioning or plain bad attempts at showing/building DC blockers for mains power. I have criticised a few of them when needed.
Such comments as this unfortunately not useful for me.

As supplement to post #80 the DC filter from Mark Levinson's ML-23 (No 23, ML23).
Attached Images
File Type: jpg Mark Levinson ML23 Primary circuit .jpg (53.8 KB, 756 views)
  Reply With Quote
Old 23rd October 2011, 06:50 PM   #83
8020 is offline 8020  Germany
diyAudio Member
 
Join Date: Mar 2011
Location: French Border
Simon7000

can you please comment on the function of this circuit and on the values of the chokes.

8020
  Reply With Quote
Old 26th November 2011, 10:53 AM   #84
tvi is offline tvi  Australia
diyAudio Member
 
tvi's Avatar
 
Join Date: Apr 2001
Location: Moonee Ponds, Vic, Australia
Haven't seen this mentioned yet?
Circuit for correcting DC voltage component in AC supply voltage
DE 4426721 BURMESTER AUDIOSYSTEME GMBH
Attached Images
File Type: png dc.png (15.3 KB, 641 views)
__________________
The small part of ignorance that we arrange and classify we give the name of knowledge.
Ambrose Bierce
  Reply With Quote
Old 26th November 2011, 11:07 AM   #85
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
because the non symetrical nature of the mains waveform changes from second to second. You can hear the transformer coming into a troubled state and going off again repeatedly, during the course of just a few minutes.
It depends very much on what other users are doing in loading the mains supply.
Switched resistors have no hope of matching the dozens/hundreds of other users loads on the constantly varying mains supply.
__________________
regards Andrew T.
  Reply With Quote
Old 29th November 2012, 08:20 PM   #86
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by tiefbassuebertr View Post
Who knows this DC blocker:
http://www.horch-gmbh.de/Produkte/Line%20Silencer.pdf
Unfortunately there is no english description available - here my try of translation of the essentials :
German:
.............
In diesem Fall schafft der HORCH Line Silencer Abhilfe! Er mißt die störende Gleichspan-
nung und neutralisiert sie. Besonderheiten des Line-Silencer hierbei sind, daß die Zeitkon-
stante des PI-Reglers auf das Driftverhalten von Transformatorkernen abgestimmt ist.
Unter Einbezug des eigenen EMV-Meßplatzes in die Entwicklung, ist es gelungen , eventuell
von dem Gerät selbst ausgehende Störungen völlig zu eleminieren. Dadurch ist gewährleistet
daß vom Line-Silencer keinerlei nachteilige Wirkung ausgehen kann!
Die Funktion des Line-Silencers wird durch Leuchtdioden angezeigt:
Gelbe LED´s : +DC / -DC: zeigt die Polarität der Gleichspannung.
Rote LED: Der Line-Silencer kompensiert aktiv.
Grüne LED : Der Gleichspannungswert ist noch so niedrig, daß keine Maßnahme erforderlich ist (ca. ±5mV).
================================================== ================================
English:
.............
In this case the HORCH Line Silencer provide the appropriate solution.
It measures the unwanted DC voltage components and compensate them.
A very special feature of the Line Silencers is follow:
The time constant of the PI controller unit is adjust to the drift behavior of transformer cores (this I don't understand).
With respect of the own EMV measuring station in the concept, it has succeeded to eleminate possibility interference completely outgoing from the device itself
(this I also don't understand).
This ensures, that can come from the line silencers no adverse effect!
The function of the Line Silencers is indicated by LEDs:
Yellow LED's: + DC / DC: indicates the polarity of the DC.
Red LED: The Line-compensated active silencers.
Green LED: The DC value is so low that no counterstep is necessary (approximately ± 5 mV).


Please note - since I don't even understand in German, the quality of English translation is of course questionable.
Perhaps one of the members can post a schematic of this device.
Who can post the schematic of this device ?
  Reply With Quote
Old 16th December 2012, 05:37 PM   #87
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
any news?
  Reply With Quote
Old 14th January 2013, 11:20 AM   #88
Jenyok is offline Jenyok  Russian Federation
diyAudio Member
 
Join Date: May 2012
Location: Russia, Moscow
One more circuit.
.
Attached Files
File Type: pdf EMI Filter V1.2_2.pdf (70.2 KB, 112 views)
  Reply With Quote
Old 15th January 2013, 08:16 AM   #89
Jenyok is offline Jenyok  Russian Federation
diyAudio Member
 
Join Date: May 2012
Location: Russia, Moscow
One more circuit of EMC filter with input DC COMPENSATION.
.
Attached Images
File Type: jpg Filter EMC2.jpg (897.1 KB, 335 views)
  Reply With Quote
Old 15th January 2013, 10:15 AM   #90
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by Jenyok View Post
One more circuit of EMC filter with input DC COMPENSATION.
.
Very interesting - this kind of dc compensation I have never seen before. After redraw for better understanding this DC filter network seems to be designed for most reliable operation in order to the electrolytic caps.
Do you find this topology in a commercial audio component or is this your own idea ?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
buzzing toroid transformer supernet Everything Else 7 20th February 2010 11:38 AM
pi filter variations CarlyBoy Tubes / Valves 7 6th December 2009 03:24 PM
buzzing transformers.... rtate Solid State 38 7th April 2008 11:33 AM
DC sensitivity of toroid transformers? tubetvr Solid State 1 15th July 2003 06:29 AM


New To Site? Need Help?

All times are GMT. The time now is 07:56 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2