DC blocker diode/cap orientation

Glen B · 05:32 PM

I know there are a lot of threads on mains DC blocking, but none I've seen address my specific question. Circuit #1 is used in a popular manufacturer's amps to block DC. I have been told that the orientation of the diodes vs caps is incorrect, that there is no protection for the caps the way it is now. Drawing #2 shows the caps reversed. Which is the right way ? Comments ?

djk · 14th May 2011, 11:36 PM

tiefbassuebertr · 07:08 PM

a good Question. Here the overview of the threads, that I know:
Variations of DC Main Filter against buzzing Toroid Transformers - what is the right?
dc filter
Thule Audio's Universal Inrush Current Limiter for their Amplifiers - very special?
My favorites are the follow topologies:
DC-Blocker - Scintilla-buizenversterkers (correct version from picture two in post #1)
L C Audio Technology / DC Filter
Because I don't understand the LC topology exactly, I ask there.
Actually there are caps necessary with reverse voltage above 1V. MKP (foil) versions unfortunately very large and expensive.

more threads outside diyaudio:
http://www.homecinema-fr.com/forum/v...03367&start=60 (many schematics and topologies)
http://forums.naimaudio.com/displayF...09120095152175
?? DIY PS Audio Humbuster
http://hifisound.com.ua/obzor-setevo...humbuster-iii/

Plitron's approach:
http://www.plitron.com/news/low-noise-technology/

To get more informations from the web arround this topic I must know all the usual terms of this unit.
There are a wide range of terms; "DC-Blocker" "Toroidal Noise Filter (Cancellator)" and "Humbuster" are only three. Who knows more terms for this unit (for google search)?

tiefbassuebertr · 21st August 2011, 10:08 AM

by using the circuit about
DC-Blocker - Scintilla-buizenversterkers
4 pcs single diodes are necessary instead one bridge rectifier.

tiefbassuebertr · 22nd August 2011, 05:46 PM

I'm curious how many threads still exist here on diyaudio associated with DC- filters and DC- blockers for toroidal power transformers.
Here again is one, that is worth mentioning, too (especially post #11, written by diyaudio member "paulmc", Chief Executive Officer = CEO by PS-Audio) :
?? DIY PS Audio Humbuster

19th August 2011, 06:49 PM	#3
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	a good Question. Here the overview of the threads, that I know: Variations of DC Main Filter against buzzing Toroid Transformers - what is the right? dc filter Thule Audio's Universal Inrush Current Limiter for their Amplifiers - very special? My favorites are the follow topologies: DC-Blocker - Scintilla-buizenversterkers (correct version from picture two in post #1) L C Audio Technology / DC Filter Because I don't understand the LC topology exactly, I ask there. Actually there are caps necessary with reverse voltage above 1V. MKP (foil) versions unfortunately very large and expensive. more threads outside diyaudio: http://www.homecinema-fr.com/forum/v...03367&start=60 (many schematics and topologies) http://forums.naimaudio.com/displayF...09120095152175 ?? DIY PS Audio Humbuster http://hifisound.com.ua/obzor-setevo...humbuster-iii/ Plitron's approach: http://www.plitron.com/news/low-noise-technology/ To get more informations from the web arround this topic I must know all the usual terms of this unit. There are a wide range of terms; "DC-Blocker" "Toroidal Noise Filter (Cancellator)" and "Humbuster" are only three. Who knows more terms for this unit (for google search)? Last edited by tiefbassuebertr; 19th August 2011 at 07:08 PM.

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14th May 2011, 11:36 PM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	__________________ Candidates for the Darwin Award should not read this author.

21st August 2011, 10:08 AM	#4
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	by using the circuit about DC-Blocker - Scintilla-buizenversterkers 4 pcs single diodes are necessary instead one bridge rectifier.

22nd August 2011, 05:46 PM	#5
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	I'm curious how many threads still exist here on diyaudio associated with DC- filters and DC- blockers for toroidal power transformers. Here again is one, that is worth mentioning, too (especially post #11, written by diyaudio member "paulmc", Chief Executive Officer = CEO by PS-Audio) : ?? DIY PS Audio Humbuster

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