Variations of DC Main Filter against buzzing Toroid Transformers - what is the right? - Page 11 - diyAudio
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Old 25th January 2013, 06:04 PM   #101
Jenyok is offline Jenyok  Russian Federation
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tiefbassuebetr
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No more interest for this theme ?
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Old 26th January 2013, 08:55 AM   #102
AndrewT is online now AndrewT  Scotland
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No, you have not told me/us what the 22r resistors do.
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Old 30th January 2013, 06:35 AM   #103
Jenyok is offline Jenyok  Russian Federation
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Resistor (22 Ohm) is necessary to select from limits of 10-100 Ohms . Power of resistor will withstand short-time maximum voltage on capacity (see below), in the set mode power in resistor repeatedly decreases.
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Without this resistor the capacitor charge occurs quickly, for one half-cycle or power line ~220 Volts. But the recharge of capacitor is caused not only the initial mains voltage ~220 Volts, but also depend under the influence of power loading. In case of power loading saltus that is characteristic for POWER AMPLIFIER, there will be also a voltage surge on capacitor. And it means that part of energy will be taken from customers at the time of origin of a saltus of power loading. That is, if on pulse the capacitor is recharged on 2 Volts, these 2 Volts will be subtracted from 310 Volts in the first half-cycle. That will pull for itself the transition process in inductivity of magnetization of a toroide.
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With the resistor power will be selected more softly, within several periods of frequency of power line ~220 Volts with constant time of RC, but some very little time voltage on capacitor to come into an opposite polarity.

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Old 30th January 2013, 09:12 AM   #104
AndrewT is online now AndrewT  Scotland
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You are looking at the wrong operational case.
Look instead at the "passing FAULT current" situation just before the fuse blows !!!!*!!!!

That schematic is dangerous and you obviously do not know how it should operate.
It should be removed from this Forum.
Before you are responsible for killing someone !!!!*!!!!
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Old 30th January 2013, 09:55 AM   #105
Jenyok is offline Jenyok  Russian Federation
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Isol-8 MiniSub Axis
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This device is used the same circuit as our circuit.
Differently between circuits is that our circuit is used two capacitors, ISOL 8 is used many capacitors connected to parallel forming two capacitors.
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Old 30th January 2013, 10:02 AM   #106
Jenyok is offline Jenyok  Russian Federation
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AndrewT
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http://www.vegalab.ru/forum/showthre...=1#post1186196
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See here, but all in Russian.
This is description of calculation parameters to this circuit.
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Old 21st May 2013, 11:23 AM   #107
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Quote:
Originally Posted by Jenyok View Post
AndrewT
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??????? - ???????
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See here, but all in Russian.
This is description of calculation parameters to this circuit.
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This could be the ultimate approach. In order to assess this surely, I need the AC inrush (and follow the idle) current flow through each part during the start-up phase. This all at different torodials with different performance and power classes so as different ratio between core wight and copper wight.
Unfortunately the losses by language translating are too large.

Last edited by tiefbassuebertr; 21st May 2013 at 11:51 AM.
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Old 24th May 2013, 10:39 PM   #108
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Quote:
Originally Posted by AndrewT View Post
Far simpler to follow the ESP circuit which is based on the various (correct) posts on this Forum.
AGREE! And this ESP/ Rod Elliot DC blocker really could not be any simpler to build: 2 caps and a diode bridge. (I built the 120V version, and it works.)

tiefbassuebetr: While I do appreciate that you are trying to be helpful and thorough, what is the point of forever collecting and diagramming every possible half-baked variation on this DC-blocking theme, even while AndrewT points out that some are potentially unsafe?
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Old 26th May 2013, 10:25 AM   #109
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Quote:
Originally Posted by Andersonix View Post
AGREE! And this ESP/ Rod Elliot DC blocker really could not be any simpler to build: 2 caps and a diode bridge. (I built the 120V version, and it works.)

tiefbassuebetr: While I do appreciate that you are trying to be helpful and thorough, what is the point of forever collecting and diagramming every possible half-baked variation on this DC-blocking theme, even while AndrewT points out that some are potentially unsafe?
The reason therefore is to find the most reliable and safe approach. AndrewT points out, that some of the variants are potentially unsafe, unfortunately without exact explanations and good to understand substantiation.
Please note: even if all agree, all can be wrong.
My own prever solution is currently the approach from BMW850 - go to post number seven about
http://www.htforum.nl/yabbse/index.php?topic=86686.0
(same as circuit from first file of post 80 here)
because there is no possibility of an unwanted reverse polarized voltage at the electrolytics. In order to a higher current flow I prefer a 63V version instead the showed 16V version.

Last edited by tiefbassuebertr; 26th May 2013 at 10:30 AM.
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Old 2nd July 2013, 05:08 PM   #110
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Guys:

None of these circuits is intrinsically safe, as long:

- Capacitors are rated below 400VDC
- Polar electrolytes are used
- Faulty open or shorted diodes are able to turn the circuit into an "explosion machine"

For moderate powers I would personally suggest:

1x 2200uF/700V MKP (For energy electronics) and 100Ohms/400W in parallel (to the cap), mounted on a sufficient heatsink ...
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Last edited by Jon Lord; 2nd July 2013 at 05:16 PM.
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