Hello Everyone,
I'm hoping to DIY something like the iFi's AC iPurifier or the Russ Andrews' AC Silencer...................
I understand that these are to be plugged on to a vacant wall socket in the house that will help "clean" up the noises thrown into the mains by the common household appliances.
Many years back I written down some notes from one of the websites (not sure if it was TNT or Acoustica or somewhere else) but I just can't it anymore. If I remember correctly it would involve a few X/Y rated capacitors and maybe a discharge resistor.
No, I'm not looking at a main conditional like the one from Jon Risch, have already built one.
Many thanks in advance for your advice.
I'm hoping to DIY something like the iFi's AC iPurifier or the Russ Andrews' AC Silencer...................
I understand that these are to be plugged on to a vacant wall socket in the house that will help "clean" up the noises thrown into the mains by the common household appliances.
Many years back I written down some notes from one of the websites (not sure if it was TNT or Acoustica or somewhere else) but I just can't it anymore. If I remember correctly it would involve a few X/Y rated capacitors and maybe a discharge resistor.
No, I'm not looking at a main conditional like the one from Jon Risch, have already built one.
Many thanks in advance for your advice.
You probally mean an EMI/RFI filter, which should be standard in each psu of a device.
The standard schematic is something like this:
https://www.electronicproducts.com/all-about-emi-filters/
The standard schematic is something like this:
https://www.electronicproducts.com/all-about-emi-filters/
Thank you Waxx,
But no, this is not what I was looking for. This is more like the one that Jon Risch shared many years back.
What I am looking for is similar to those commercial products that supposed to be plugged onto any vacant wall socket, that supposed to soak up noise in the mains that are dumped into the mains by common household appliances.
But no, this is not what I was looking for. This is more like the one that Jon Risch shared many years back.
What I am looking for is similar to those commercial products that supposed to be plugged onto any vacant wall socket, that supposed to soak up noise in the mains that are dumped into the mains by common household appliances.
Well, his site is here: http://www.geocities.ws/jonrisch/index.htm
And there he talks about exact the same thing as AC Power Line Filter & Surge Suppresor: http://www.geocities.ws/jonrisch/surge.htm
And there he talks about exact the same thing as AC Power Line Filter & Surge Suppresor: http://www.geocities.ws/jonrisch/surge.htm
What you originally described is a snakeoil product that just doesn't work; maybe if household wiring was superconductive, but not in reality. As Waxx mentioned above, a inlet EMI/RF filter is designed for this purpose, both to prevent noise from entering the device and to keep the noise generated by the device from feeding back into the mains. Any decently designed equipment should already have one of these, whether as a integrated power inlet filter or as a discrete design as part of it's power supply. One thing that can help is a power conditioner, and I meant the ones with an isolation transformer inside (such as those made by OneAC) not the rack mount units from Furman and others that are basically just very expensive versions of the inlet filters mentioned above. The inductance in the transformer will help reduce any lower frequency (not RF) voltage spikes that would not be affected by the EMI filter in the unit. They are available in various sizes, some of which can condition the power for an entire rack of equipment; I have a 3.3KVA unit that provides two 15A circuits for my test equipment racks and several smaller ones around the house for other computer and networking gear and I couldn't be happier.
Hal
Another note on the EMI/RF filters: their performance, both the filtered frequency range and the actual reduction in the noise present, is dependant on the current flowing through them - this is why they are typically integrated in each piece of equipment so as to match the filter with the load. The filter's data sheet will show the load/dB curve and should be followed for each application.
Hal
Hal
How an earth would they do that?
Remember how a few years back the very same crap was sold as an energy saving device?
Remember Dave's video debunking this?
He proved they are just money waste.
Now they have changed the benefits of the same thing?
It does not save energy but it does clean up the mains?
How the hell would they do it? A filter works only for what is after it.
Don't we ever learn?
As @waxx says just about any decent power supply already contains a common mode mains filter.
Plugging some other filter in some socket does not help with anything, it's just a waste of time and money.
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if the OP was referring to this https://www.russandrews.com/the-silencer/ then they only work in your head and on your wallet.
Yes, that is what I was referring to.
I also found this on YouTube yesterday, and probably similar concept:
So looks like most think this is just some made-up theoretical stuff that have no use in reality................ I'm not going to waste more time on this.
It amazes me the level of crap on youtube...
But it's down right sad to see so many people paying close attention to it.
None of them understand basic physics, and some crooks make good money on them.
But it's down right sad to see so many people paying close attention to it.
None of them understand basic physics, and some crooks make good money on them.
I use a 275/20 MOV, live to neutral, permanently connected at my house.
In parallel, you can put a 0.1 uf / 400 v Polyester, with a 1K ohm / 1W in series, as a further noise absorber.
It absorbs a lot of noise, and contacts do not pit during switching.
I have about 9 kW loads, not all used at the same time.
We are at 220V, you can go to 140 to 150 if you are on a 120V system for the MOV.
The second figure is for diameter, here 20 mm, figure out the requirement from data sheets.
Be very careful, electric shocks are dangerous.
Also proper earthing and cable shielding are very useful in reducing induced electrical noise, also good quality switch contacts, arcing is noisy.
In parallel, you can put a 0.1 uf / 400 v Polyester, with a 1K ohm / 1W in series, as a further noise absorber.
It absorbs a lot of noise, and contacts do not pit during switching.
I have about 9 kW loads, not all used at the same time.
We are at 220V, you can go to 140 to 150 if you are on a 120V system for the MOV.
The second figure is for diameter, here 20 mm, figure out the requirement from data sheets.
Be very careful, electric shocks are dangerous.
Also proper earthing and cable shielding are very useful in reducing induced electrical noise, also good quality switch contacts, arcing is noisy.
MOV is spike buster, arc quencher and over voltage protector.
Mine will short the mains if volts go above 275, preventing damage to my equipment.
Costs pennies.
Read up about it.
Have you seen arc suppressing caps in portable electrical tools?
The machines with armatures and field coils in series, with a commutator and brushes?
Ever wondered why some bean counter allowed them to be used in spite of their cost?
Again, read up about it, before making ill informed statements.
Mine will short the mains if volts go above 275, preventing damage to my equipment.
Costs pennies.
Read up about it.
Have you seen arc suppressing caps in portable electrical tools?
The machines with armatures and field coils in series, with a commutator and brushes?
Ever wondered why some bean counter allowed them to be used in spite of their cost?
Again, read up about it, before making ill informed statements.
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More like it could set your house on fire...
When clamping the mains the MOV dissipates an enormous amount of energy, without a well calibrated and fast fuse near it, the consequences can be disastrous!
Besides the stupidity of this risk, any decent power supply ( and some of the cheap ones even ) already has MOV protection on the mains input.
Any decent electronics engineer knows that very well, and knows that there is no need for such so called "protection".
That has absolutely nothing to do with what is discussed here!
I repeat: A filter works only for what is after it, not before it.
It would be like mounting a water filter on one of the taps in the house, and claiming that all the taps now have filtered water... it's ridiculous.
And again as i said before, any decent supply already has mains filtering, but if you want further filtering than you use a proper mains filter in series with each and every equipment in your home or office.
That's how it's done, that's how basic physics work ( which i do encourage you to learn ).
1. That is not right. A mains filter with a polluting load will also work the other way. Often it is the main purpose of the filter as the load is the polluter of the grid.
2. MOVs are standard parts in mains protection devices of sorts but of course always with a fuse as otherwise the village transformer will be protected 🙂. Often used in mains filters and sometimes almost mandatory in for instance mountainous areas. Adding a second one is not necessary, adding one in case there isn't one is OK as long as you know what you are doing. Not for the average DIYer.
These separate Purifier devices (as in: mains plug separated from equipment and in fact in parallel with other equipment) are very good devices for some to earn money with a Schuko plug. If one is so thick to believe pure nonsense one deserves such devices. The marketing texts of such devices are often BS and meant to provoke emotions. If they would do something it would be marginal as then these would need to shunt the mains installation in the home. So: even if it would be slightly effective things will be way more effective on a per device basis in series.
We can compare it with colored/cartoon bandaids for children. Sticking one with Dora the Explorer to a tiny scratch will make this kid stop crying faster.
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I have a mechanical engineering degree with three years of electrical engineering as part of the course, two years had basic electronics also, and the course has elements of physics as well.
I finished in 1989, some 33 years back.
How about you?
Do you know about parallel connections, so my entire house in protected?
And that I do have MCBs at the mains and air conditioners?
MCB is a no-fuse breaker, and I have switches with fuses after those as well.
The power tool bit was just to say that in some cases protection is needed, even if the accounts people do not like the cost.
I finished in 1989, some 33 years back.
How about you?
Do you know about parallel connections, so my entire house in protected?
And that I do have MCBs at the mains and air conditioners?
MCB is a no-fuse breaker, and I have switches with fuses after those as well.
The power tool bit was just to say that in some cases protection is needed, even if the accounts people do not like the cost.
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I have used MOV across heater contactors, a noticeable arc reduction and also contact pitting reduction was evident.
I do know what I am talking about.
I am absorbing the mains noise from the grid into my house.
If you need noise reduction in medical grade equipment, a proper isolation transformer is needed.
It depends on the tolerance level of the equipment, and its sensitivity to noise...
Audiophools will go to great lengths about it, but a water pump does not need much protection.
Do you consider that?
I do know what I am talking about.
I am absorbing the mains noise from the grid into my house.
If you need noise reduction in medical grade equipment, a proper isolation transformer is needed.
It depends on the tolerance level of the equipment, and its sensitivity to noise...
Audiophools will go to great lengths about it, but a water pump does not need much protection.
Do you consider that?
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Maybe i did not make myself very clear, sorry for that.
Indeed a proper mains filter works both ways, and of course it's job is to protect the mains from the load noise.
But what i meant to say is that you need to insert the filter in series with something in order to do it's job.
What is discussed here is that you simply insert some no-name no specs filter on some wall plug and hey presto you get a well filtered mains in all of the house.
That's just stupid and naive.
No, you don't!
That's just the problem.
I don't care what degree you hold and what ever you claim to have, what you say here is totally nonsense!
Proper filtering and protection is well discussed in electronics engineering books and papers, in app notes, and so on.
Not on youtube, not on no name blogs, and not on different commercial sites that sell this useless crap just to cheat you of your money.
As someone said, they only work in your mind.