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Old 25th February 2011, 10:08 AM   #181
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by iliya4 View Post
.... talk about reverse voltage (forward Voltage?) of the capacitor itself;
thats why we want to put the caps back to back in series not in parallel like Bryston.

So putting the caps in series bypasses this danger of having max of about 1-1.5 Vf of the cap?
I chose high power diodes that combined will form about 2.2 Vf (~1.1 each); is it too high for the caps (same question)?.
from what you are saying and asking it appears you do not understand what the DC blocker is doing nor do you understand it's limitations and what needs to be done to make it's adoption safe.

Go back and re-read the DC blocker's operation. When some components pass current and when other components pass current.

This is a LIVE circuit. You must ensure you can assemble and install it safely.
If you have any doubts about it's assembly I cannot see how you can install it safely !!!!
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Old 25th February 2011, 11:04 AM   #182
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Thanks for replying Andrew.

Worry not, I've worked with tube amps and high voltage before.
Just the back to back cap that forms bi-polar cap, reverse bias is not quite clear.
Also the total Ripple current of these caps in series would be.
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Old 25th February 2011, 11:19 AM   #183
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Sorry for double posting (I can't edit previous posts).

I understand the formulas involved.

Using Ohm law I calculated that for 10A and 2 Vf of the diodes it would be 0.2 ohm of resistance.
Using 1/(2*Pi*50*0.2) I got ~16000uF.
So at least two 32000uF caps in parallel (back to back).

I plan to use 47000uF 16v Nichicon with 6.93A ripple Current each.
The diodes I use:
http://www.rectron.com/data_sheets/10a05-10a10.pdf

So the quiestions I posted are still valid.

Thanks
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Old 6th March 2011, 11:28 AM   #184
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bump.

Is it worth building a DC blocker with a DC offset of 20mV on the mains?
I measuer across the cap with 100k and 10uF.

My studio monitors hum.
Each is 110W.
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Old 6th March 2011, 12:11 PM   #185
AndrewT is offline AndrewT  Scotland
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listen to the mechanical hum of your transformer and what it does to the chassis of your equipment.
Fit a temporary DC blocker and compare results.
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Old 29th April 2011, 11:38 AM   #186
Ivchikx is offline Ivchikx  Latvia
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What exact diodes and cap ratings shoud I use to bild a DC-filter for 600VA transformer?
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Old 29th April 2011, 12:30 PM   #187
AndrewT is offline AndrewT  Scotland
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1n5401, or 5402, or 5403, or 5404. Two in series in each direction (4 total).

10mF to 20mF 16V electrolytic. Two in series +ve to +ve.

The 10m to 20m capacitance can be a parallel bank of lower value capacitors. They might be cheaper. I use 3300uF 16V, 5 in parallel in each direction for a net 8m25F which has an impedance of ~0.4 ohm at 50Hz.
2Aac will generate ~1.1Vpk across the caps and diodes. The diodes should not pass when 2Aac is being drawn.
That allows ~500W to be consumed and the bypass diodes should not pass.
Current pulses exceeding 3Apk will bypass via the diodes.
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Old 29th April 2011, 04:33 PM   #188
Ivchikx is offline Ivchikx  Latvia
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Forgot to mention, in my country mains are at 220V 50Hz AC.

Is it possible to use diodes 1N5408?

Did I get schematic right?
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Old 29th April 2011, 04:38 PM   #189
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You can use any voltage rating since the max voltage is 1-2 volts only. Personally I would choose 6 A diodes.


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Old 29th April 2011, 07:59 PM   #190
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Quote:
Originally Posted by Ivchikx View Post
What exact diodes and cap ratings shoud I use to bild a DC-filter for 600VA transformer?
check out this URLs:
Mains DC and Transformers
Variations of DC Main Filter against buzzing Toroid Transformers - what is the right?
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