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Old 14th May 2011, 05:29 PM   #1
Glen B is offline Glen B  United States
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Default DC blocker diode/cap orientation

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 ?
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Last edited by Glen B; 14th May 2011 at 05:32 PM.
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Old 14th May 2011, 11:36 PM   #2
djk is offline djk
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Old 19th August 2011, 06:49 PM   #3
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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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Old 21st August 2011, 10:08 AM   #4
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by using the circuit about
DC-Blocker - Scintilla-buizenversterkers
4 pcs single diodes are necessary instead one bridge rectifier.
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Old 22nd August 2011, 05:46 PM   #5
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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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