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Old 16th February 2010, 01:32 PM   #151
tiefbassuebertr is offline tiefbassuebertr  Germany
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in this case this thread could be of interest:
http://www.diyaudio.com/forums/solid...hat-right.html
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Old 16th February 2010, 01:59 PM   #152
peranders is offline peranders  Sweden
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Mr. Tiefbass, did you notice that you picked up an very old thread?
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Old 26th May 2010, 02:37 PM   #153
Sebastiaan is offline Sebastiaan  Netherlands
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Quote:
Originally Posted by weinstro View Post
I've attached a snapshot of a schematic from such a well-known manufacturer. They use 33,000uF, 6.3Vdc caps, connected in parallel.
I believe Bryston use this DC blocker circuit in order to make their Triac inrush current limiter alias power switch to work. DC on the mains can disturb the zero crossing sensing circuit, and can make the triac triggering on the wrong moments. As a bonus it remove DC offset from the line. In Bryston's case it didn't help for transformer humm. I owne several Bryston amps till the 7B's and many of my clients own 4B's and all the (expensive) Plitron transformers have hum in more or less extend.

If people intend to built a DC blocker themselves I strongly advice to simply copy the bryston one with a bridge rectifier, to stay on the safe side.

With kind regards,
Bas
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Old 26th May 2010, 06:07 PM   #154
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by peranders View Post
Mr. Tiefbass, did you notice that you picked up an very old thread?
What means for you the term "very old" ??
This forum is 10 years old, not 100 years !! Only for computer/EDV stuff 10 years is very old, but not for analog stuff like amps and power supplies - so I think
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Old 24th November 2010, 08:41 PM   #155
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by weinstro View Post
No problem with that.

I took a snapshot from a PDF schematic downloaded from Bryston. It's for a 3B-SST amplifier. Closer inspection reveals that the transformer originally shown is not the power transformer. I've attempted to attach another screen shot.


However, the power transformer does seem to connect through the DC blocker through a varistor. Also, there is a second diode bridge connected to the secondaries of the main transformer, without the capacitors of a dc blocker on page 1 of the schematic. I'm not sure what that is intended to do.

Please let me know, from which Bryston model you have posted this schematic?
Thank you very much in advance.

Quote:
Originally Posted by tiefbassuebertr View Post
in this case this AES article is very interesting:
http://www.plitron.com/pdf/AES.pdf
This URL is death in the meantime, therefore I will post this pdf here:

Last edited by tiefbassuebertr; 24th November 2010 at 08:46 PM.
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Old 24th November 2010, 08:44 PM   #156
peranders is offline peranders  Sweden
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Quote:
Originally Posted by tiefbassuebertr View Post
What means for you the term "very old" ??
This forum is 10 years old, not 100 years !! Only for computer/EDV stuff 10 years is very old, but not for analog stuff like amps and power supplies - so I think
"Old" means a thread which hasn't got any new posts for quite some time.
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Old 25th November 2010, 08:50 AM   #157
tiefbassuebertr is offline tiefbassuebertr  Germany
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Default ACOUSTIC NOISE EMITTED BY POWER TRANSFORMER - continuation from post #155

Quote:
Originally Posted by peranders View Post
Mr. Tiefbass, did you notice that you picked up an very old thread? "Old" means a thread which hasn't got any new posts for quite some time.
The actually question is, what is the better way: to start many small threads or only few threads to the same topic. If it is desired to avoid reviving old threads, the first is the better solution. If it is desired to have all comments together within the same topic, I prefer the second, because in such cases this is the better solution.

Quote:
Originally Posted by weinstro View Post
No problem with that.

I took a snapshot from a PDF schematic downloaded from Bryston. It's for a 3B-SST amplifier. Closer inspection reveals that the transformer originally shown is not the power transformer. I've attempted to attach another screen shot.


However, the power transformer does seem to connect through the DC blocker through a varistor. Also, there is a second diode bridge connected to the secondaries of the main transformer, without the capacitors of a dc blocker on page 1 of the schematic. I'm not sure what that is intended to do.
Please let me know, from which Bryston "MK" editionof model "3BSST" you have posted this schematic sample?
Thank you very much in advance. URL for schemas are follow:
http://bryston.com/BrystonSite05/BrystonDocs.html

Last edited by tiefbassuebertr; 25th November 2010 at 09:20 AM.
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Old 25th November 2010, 10:17 AM   #158
nikosokey is offline nikosokey  Greece
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DC Filter für 10€
DIY Audio Projects ------ tips and tricks
Two useful links.
I have made this dc filter and now has stopped the noise from the transformers.
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Old 25th November 2010, 10:35 AM   #159
BMW850 is offline BMW850  Netherlands
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Here you have another DC Blocker this one I use in my mono blocks and this works perfect:
DC-Blocker - Scintilla-buizenversterkers

Rudy

Click the image to open in full size.
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Last edited by BMW850; 25th November 2010 at 10:38 AM.
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Old 25th November 2010, 11:35 AM   #160
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by BMW850 View Post
Here you have another DC Blocker this one I use in my mono blocks and this works perfect:
DC-Blocker - Scintilla-buizenversterkers

Rudy

Click the image to open in full size.
Thank you for posting this topology. Must actually be the royal way and I have never see before in commercial products. The schematic collection, that I know from commercial products, you will find by post #1 about
http://www.diyaudio.com/forums/solid...hat-right.html
What is the reason for the choiced polarity of the electrolytic caps (positive pole to anode and negative pole to cathode)? The voltage in the reverse mode is commonly 1V (independend of the voltage values in normal mode).

Last edited by tiefbassuebertr; 25th November 2010 at 11:45 AM.
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