Unfortunately All this sucks, cos not any improvements on the sound quality but worsening all system.
Tested this with 44 000 micro farads total capacity.
My amp. has toroid rated 2KW/12 kg weight.
Reduced dynamics on the bass and mid range and maybe treble.
Just a little sharpen sound and loose power and dyn, the amp sounded like a 20 watts amp even is 500w@4 ohm.
I will think for a better filter, any way I don't have problem with buzz perhaps two- three times a day and all this is for about 30 seconds.
Any new suggestion to build a clean AC but not the sound affection or better sound? 😕
Tested this with 44 000 micro farads total capacity.
My amp. has toroid rated 2KW/12 kg weight.
Reduced dynamics on the bass and mid range and maybe treble.
Just a little sharpen sound and loose power and dyn, the amp sounded like a 20 watts amp even is 500w@4 ohm.
I will think for a better filter, any way I don't have problem with buzz perhaps two- three times a day and all this is for about 30 seconds.
Any new suggestion to build a clean AC but not the sound affection or better sound? 😕
I'll guess you have missed the point of the filter. It is only for reducing an accustical problem in the transformer. The filter won't clean the AC at all.
I agree 100% with you.
But according to some readings mentioned before here and other places on the net, some says that this or oher similar filter improove the sound!
I tested this with bypass wire during the listening and notice just a little bit less noise on the tweeter and perhaps less trafo. noise, but the sound is worse!
I also watched other type of "POwer source or conditioner" but they works totally different AC>DC than processing the sine wave > amplifier and balanced trafo. at the output 110 - 0 - 110 , or 115 - 0 - 115 standard for today 230 V here.
I thought to use a choke, a very big one, taken from the big welding machine weights about 50 KG , EI or UI core and it is winded with square wire about 10mm X 5mm, I measured it is a 2mH inductance with a tap in the middle!
The resistance with regular avometer is not possible to measured cos it is the same as when short circuit leads of the meter.
Is this usable for some AC main filtering???🙂
But according to some readings mentioned before here and other places on the net, some says that this or oher similar filter improove the sound!
I tested this with bypass wire during the listening and notice just a little bit less noise on the tweeter and perhaps less trafo. noise, but the sound is worse!
I also watched other type of "POwer source or conditioner" but they works totally different AC>DC than processing the sine wave > amplifier and balanced trafo. at the output 110 - 0 - 110 , or 115 - 0 - 115 standard for today 230 V here.
I thought to use a choke, a very big one, taken from the big welding machine weights about 50 KG , EI or UI core and it is winded with square wire about 10mm X 5mm, I measured it is a 2mH inductance with a tap in the middle!
The resistance with regular avometer is not possible to measured cos it is the same as when short circuit leads of the meter.
Is this usable for some AC main filtering???🙂
Right, I believe in own hearing which is 90 % same as the rest other hearing.
People believe in your ears don't hang on others lies.
This was just a test.
The real sound improvement is coming soon.
People believe in your ears don't hang on others lies.
This was just a test.
The real sound improvement is coming soon.
7:03 local time here!!!
Wow This is amazing what happened here!!!!!.
As a thought before I did a very, very big improvement to all sound in my ROOM.
I know that my sixth sense or thoughts never go wrong way.I can't believe how much I improve the sound of my system.
If I say in per cent that will be 30 - 40 % better.
The sound with bypassed filter sound lake a saw in the middles, and with filter is a lot smooth and warm and the trebles are a lot open and as I noticed for this 3 minute test stereo and 3d image is opening like a new window, a very big and wide window....it's just unbelieveable.
This first test include just a 50 KG weight choke with 10mm X 4 mm and one Varistor at the output.
I'll try with some caps. with various capacitance I got here from 4 micro to 66,6 KVAR 400 volts AC taken from the power distributions from a condenser battery!!!
Wow This is amazing what happened here!!!!!.
As a thought before I did a very, very big improvement to all sound in my ROOM.
I know that my sixth sense or thoughts never go wrong way.I can't believe how much I improve the sound of my system.
If I say in per cent that will be 30 - 40 % better.
The sound with bypassed filter sound lake a saw in the middles, and with filter is a lot smooth and warm and the trebles are a lot open and as I noticed for this 3 minute test stereo and 3d image is opening like a new window, a very big and wide window....it's just unbelieveable.
This first test include just a 50 KG weight choke with 10mm X 4 mm and one Varistor at the output.
I'll try with some caps. with various capacitance I got here from 4 micro to 66,6 KVAR 400 volts AC taken from the power distributions from a condenser battery!!!
that does not sound like a DC blocker for the transformer.zoranaudio said:7:03 local time here!!!
Wow This is amazing what happened here!!!!!.
As a thought before I did a very, very big improvement to all sound in my ROOM.
I know that my sixth sense or thoughts never go wrong way.I can't believe how much I improve the sound of my system.
If I say in per cent that will be 30 - 40 % better.
The sound with bypassed filter sound lake a saw in the middles, and with filter is a lot smooth and warm and the trebles are a lot open and as I noticed for this 3 minute test stereo and 3d image is opening like a new window, a very big and wide window....it's just unbelieveable.
This first test include just a 50 KG weight choke with 10mm X 4 mm and one Varistor at the output.
I'll try with some caps. with various capacitance I got here from 4 micro to 66,6 KVAR 400 volts AC taken from the power distributions from a condenser battery!!!
Yeah, this should be in new thread, finally I ll go to sleep a bit now and will inform you more, by the way till now tested this maybe 20 times with and without filter, just bypassing the filter with wire(this maybe dangerous) because of sparking), that's why I connected a MOV 275 volts on the output to the all equipment.
Obviously is that the sound threw the filter is a lot, a lot clear in the middles and trebles, and the bass for the first time I thought is a bit weeker, but this is not true, cos I noticed is too much well defined and tight.
I made this test with funny wire just 2 X 075mm^2, just for test, and when "tune up" this I would like to fixeed in solid metal box with shielded input cable....etc.
The choke I used is a very big one it is taken from the welding machine winded with square copper 10x4mm, and with simple avometer or LCR meter can not measure the resistance cos it is to small I guess 0,00??? or 0,000??? DC resistance.
Inductance I measured is 2mH total, but it is a gap in the center 1mH.
What do you think about this and I want to connect some caps on input to common, gap to common, or output to common to make a low pass filter?
Right now it's just a choke and sounds better i mentioned but there is some little buzz when i put my ear on the choke very close, and look to me like a RF noise not 50 or 100HZ, but something mixed like 50 HZ modulated with some high frequency,, and i think that is the reason for some increased noise on the tweeter, without music, and of course with my ear tight to the tweeter, the noise is a bit increased, but all sound is better as mentioned before, more open, clearer and a bit louder but not distorded.
What do you think?
Obviously is that the sound threw the filter is a lot, a lot clear in the middles and trebles, and the bass for the first time I thought is a bit weeker, but this is not true, cos I noticed is too much well defined and tight.
I made this test with funny wire just 2 X 075mm^2, just for test, and when "tune up" this I would like to fixeed in solid metal box with shielded input cable....etc.
The choke I used is a very big one it is taken from the welding machine winded with square copper 10x4mm, and with simple avometer or LCR meter can not measure the resistance cos it is to small I guess 0,00??? or 0,000??? DC resistance.
Inductance I measured is 2mH total, but it is a gap in the center 1mH.
What do you think about this and I want to connect some caps on input to common, gap to common, or output to common to make a low pass filter?
Right now it's just a choke and sounds better i mentioned but there is some little buzz when i put my ear on the choke very close, and look to me like a RF noise not 50 or 100HZ, but something mixed like 50 HZ modulated with some high frequency,, and i think that is the reason for some increased noise on the tweeter, without music, and of course with my ear tight to the tweeter, the noise is a bit increased, but all sound is better as mentioned before, more open, clearer and a bit louder but not distorded.
What do you think?
hi,
i'd like to refer to the post nr. 13, the simplest DC blocker, http://diyparadise.com/web/images/stories/dcblocker.gif
there were some notes about the reversed polarity of the diodes, as well as few people did it as pictured and it worked.
i've had 0.5 V DC in my mains, after building this (diodes back to back as well front to front) im getting cca 1.2 V DC. how is it possible? i dont have much experience with diodes but i thought i could succeed with something this simple..
thanks for opinions
m.
i'd like to refer to the post nr. 13, the simplest DC blocker, http://diyparadise.com/web/images/stories/dcblocker.gif
there were some notes about the reversed polarity of the diodes, as well as few people did it as pictured and it worked.
i've had 0.5 V DC in my mains, after building this (diodes back to back as well front to front) im getting cca 1.2 V DC. how is it possible? i dont have much experience with diodes but i thought i could succeed with something this simple..
thanks for opinions
m.
post13 is wrong
http://www.diyaudio.com/forums/power-supplies/104626-dc-blocking-filter-mains.html#post1248952
http://www.diyaudio.com/forums/power-supplies/104626-dc-blocking-filter-mains.html#post1249316
for a fuller explanation
http://www.diyaudio.com/forums/power-supplies/104626-dc-blocking-filter-mains.html#post1261665
http://www.diyaudio.com/forums/power-supplies/104626-dc-blocking-filter-mains.html#post1248952
http://www.diyaudio.com/forums/power-supplies/104626-dc-blocking-filter-mains.html#post1249316
for a fuller explanation
http://www.diyaudio.com/forums/power-supplies/104626-dc-blocking-filter-mains.html#post1261665
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your comments make sense. But still, few forum members reported that it works so it bugs me how could i get even more voltage than before filtering..
i guess i'll order a 1:1 separating transformer with an air gap to block DC. i just dont have the time and motivation for in-depth study of this topic...
i guess i'll order a 1:1 separating transformer with an air gap to block DC. i just dont have the time and motivation for in-depth study of this topic...
possibly. i may dive into all this theory for a few weeks.. as everything where it doesn't seem to be one (preferably simple) strategy. i'll start with re-reading this thread more carefully.
thanks for tip Andrew, i've just ordered a PCB. I'm curious, its still a 2 (or more) diodes + 2 big caps design. Somewhere i've read that more effective is the approach with two full-wave rectifiers and just a 0.47 cap after, as in AVA Humdinger. But i'm not good in the theory.
all the best,
misok
all the best,
misok
You could try the circuit Crown uses, or the Bryston circuit.
Both are simple, no PC board needed.
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Only one bridge needed on the Crown circuit for amps less than 1KW.
The bridge on the left on the Bryston is to isolate the audio ground from the chassis, you may not need it. If you delete the big electrolytics from the Bryston it's basically the same as the Crown.
Both are simple, no PC board needed.
Only one bridge needed on the Crown circuit for amps less than 1KW.
The bridge on the left on the Bryston is to isolate the audio ground from the chassis, you may not need it. If you delete the big electrolytics from the Bryston it's basically the same as the Crown.
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The Crown version has no capacitors. It does not work as a DC blocker of Mains power.
The Bryston version with the 33mF caps works. It blocks DC from Mains power
AND it has a bypass for start up current and/or Fault current.
Note that Bryston have the DC blocker in the Neutral side. IT IS STILL LIVE !!!!!
Bryston do not show the PE connection to Chassis. They show a broken orange line and a note instead.
YOU MUST add that PE to Chassis connection. Bolt the Chassis wire and use a mechanical connection to the PE terminal of the Mains input Socket.
The Bryston version with the 33mF caps works. It blocks DC from Mains power
AND it has a bypass for start up current and/or Fault current.
Note that Bryston have the DC blocker in the Neutral side. IT IS STILL LIVE !!!!!
Bryston do not show the PE connection to Chassis. They show a broken orange line and a note instead.
YOU MUST add that PE to Chassis connection. Bolt the Chassis wire and use a mechanical connection to the PE terminal of the Mains input Socket.
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?????
Whether the bypass caps are there or not, the diodes have the same function in both examples. The caps just allow some continuation of AC current during portion of voltage waveform when diodes are not conducting (ie. near zero crossing).
" It does not work as a DC blocker of Mains power."
Yes it does, that's why it's there, and it eliminates the torroid buzz that would be there otherwise, and if per chance it does not work (not likely), you can easily convert it to the Bryston scheme by adding the caps.
Yes it does, that's why it's there, and it eliminates the torroid buzz that would be there otherwise, and if per chance it does not work (not likely), you can easily convert it to the Bryston scheme by adding the caps.
The diodes have a completely different function.
The DC blocking does not need the diodes and gets absolutely no benefit from the diodes.
The DC blocking effect comes solely from the capacitor/s.
Use a 66mF (33mF+33mF adopted by Bryston) X2 rated film type capacitor and the DC blocking works perfectly upto the maximum current specified by the manufacturer.
But there is a problem. It won't fit inside your car to bring it home.
Oh, and can you find a manufacturer?
We end up using electrolytics.
for low cost and low size we adopt lower voltage capacitors than the rated Mains voltage.
Here is why we add the diodes. To LIMIT the maximum voltage across the capacitors when the capacitors cannot match the current demands of the transformer.
This applies when we put in too little capacitance and/or start up the transformer and/or abuse the output of the transformer.
The diodes are ONLY there to protect the capacitor from damage !!!!!!!
Once you accept that you can then stretch the deign by adopting a capacitor voltage that is considerably less than the rated mains supply voltage.
16Vdc and 25Vdc are commonly used.
You will also see designers and builders adopting 6Vdc and 10Vdc capacitor, because the diode protect them from damage during periods of abuse.
The DC blocking does not need the diodes and gets absolutely no benefit from the diodes.
The DC blocking effect comes solely from the capacitor/s.
Use a 66mF (33mF+33mF adopted by Bryston) X2 rated film type capacitor and the DC blocking works perfectly upto the maximum current specified by the manufacturer.
But there is a problem. It won't fit inside your car to bring it home.
Oh, and can you find a manufacturer?
We end up using electrolytics.
for low cost and low size we adopt lower voltage capacitors than the rated Mains voltage.
Here is why we add the diodes. To LIMIT the maximum voltage across the capacitors when the capacitors cannot match the current demands of the transformer.
This applies when we put in too little capacitance and/or start up the transformer and/or abuse the output of the transformer.
The diodes are ONLY there to protect the capacitor from damage !!!!!!!
Once you accept that you can then stretch the deign by adopting a capacitor voltage that is considerably less than the rated mains supply voltage.
16Vdc and 25Vdc are commonly used.
You will also see designers and builders adopting 6Vdc and 10Vdc capacitor, because the diode protect them from damage during periods of abuse.