Variations of DC Main Filter against buzzing Toroid Transformers - what is the right? - Page 10 - diyAudio
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Old 15th January 2013, 10:28 AM   #91
AndrewT is offline AndrewT  Scotland
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The DC compensation is flawed !
There is no bypass around the capacitor if there is a fault current.
The capacitor will end up taking the full fault voltage (since the fault current cannot flow unimpeded) and blow up !

Far simpler to follow the ESP circuit which is based on the various (correct) posts on this Forum.
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Old 15th January 2013, 11:53 AM   #92
Jenyok is offline Jenyok  Russian Federation
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Quote:
Originally Posted by tiefbassuebertr View Post
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 ?
.
This circuit was made many times and discised in Russian forums.
Circuit works very good.
Sorry, web link has a russian characters.
.
Ещё раз о сетевом фильтре
.

Last edited by Jenyok; 15th January 2013 at 11:57 AM.
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Old 15th January 2013, 02:19 PM   #93
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Quote:
Originally Posted by Jenyok View Post
.
This circuit was made many times and discised in Russian forums.
Circuit works very good.
Sorry, web link has a russian characters.
.
Ещё раз о сетевом фильтре
.
thank you for this URL.

by post 13 about
http_www_vegalab.ru/forum/showthread.php/19974-Ещё-раз-о-сетевом-фильтре
Ещё раз о сетевом фильтре
I read follow concerning the attached schematic (DC Filter):

Вот вариант фильтра DC, где можно поставить диодные сборки с общим катодом, которых валом на каждом рынке.

What means that?

Post 64 about
Ещё раз о сетевом фильтре - Страница 4
shows an other variation again - also never seen before. In use there are bi-directionale zeners
All DC filter schemas that I have seen there you will find here in the attached files.
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Old 15th January 2013, 02:58 PM   #94
Jenyok is offline Jenyok  Russian Federation
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Вот вариант фильтра DC, где можно поставить диодные сборки с общим катодом, которых валом на каждом рынке.
.
Two diodes with common cathode in one case (for example, case TO-220), which you could buy anywhere.
.

Last edited by Jenyok; 15th January 2013 at 03:12 PM.
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Old 15th January 2013, 03:42 PM   #95
Jenyok is offline Jenyok  Russian Federation
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http://www.power-e.ru/2007_01_82.php
.
This is interesting and useful article about EMC filter, but in Russian.
.
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Old 18th January 2013, 09:44 AM   #96
Jenyok is offline Jenyok  Russian Federation
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This is corrected circuit of DC compensated.
All diodes are 6A8 (not LL4148) !
All resistors are 1 Watt.
.
Attached Files
File Type: pdf DC compensate.pdf (12.0 KB, 157 views)
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Old 18th January 2013, 10:28 AM   #97
AndrewT is offline AndrewT  Scotland
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What do the two pairs of resistors achieve?

Hint:
what fault current can pass a 22r without it blowing up/going open circuit?
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Old 18th January 2013, 11:04 AM   #98
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Quote:
Originally Posted by AndrewT View Post
The DC compensation is flawed !
There is no bypass around the capacitor if there is a fault current.
The capacitor will end up taking the full fault voltage (since the fault current cannot flow unimpeded) and blow up !

Far simpler to follow the ESP circuit which is based on the various (correct) posts on this Forum.
D1 and D4 (first image post #93) must be reversed, also C1 and C2 (go to the PDF by post #96).
Quote:
Originally Posted by Jenyok View Post
This is corrected circuit of DC compensated.
All diodes are 6A8 (not LL4148) !
All resistors are 1 Watt.
.
how the formula for the calculation to get the resistor value "22R"

Last edited by tiefbassuebertr; 18th January 2013 at 11:06 AM.
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Old 19th January 2013, 05:48 AM   #99
Jenyok is offline Jenyok  Russian Federation
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tiefbassuebetr
.
There are two base different circuts of DC compensation, see my posts #89 and #96.
Circuit from post #89 has two pairs of diodes with common anode.
Circuit from post #96 has two pairs of diodes with common cathode VD1, VD2 and VD3, VD4, but without resistors R1 and R4 .
.
And more, there are two modifications of base circuits where two resisrors 22 Ohm added.
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Old 21st January 2013, 03:47 PM   #100
Jenyok is offline Jenyok  Russian Federation
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tiefbassuebetr
.
Read this forum, but all forum is in russian.
This is Very, very interesting for you.
If you need, ask any questions about russian forum.
.
You will not see any circuits, I will send you login and password.
.
http://audioportal.su/showthread.php...8;-AlexKorotov

Last edited by Jenyok; 21st January 2013 at 03:55 PM.
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