It will produce very high electromagnetic radiation outside the 30 cm.
Shielding inductive slightly better. But still exist.
A bigger ring inductance radiation.
Almost no attention to the high frequency interference caused by radiation.
Advice from your digital amplifier 3 m above the distance.
😀
Shielding inductive slightly better. But still exist.
A bigger ring inductance radiation.
Almost no attention to the high frequency interference caused by radiation.
Advice from your digital amplifier 3 m above the distance.
😀
I think it's a general post. It's the language barrier that causes it to appear as a reply rather than a thread starter.
In general, I agree that switch mode circuits can sometimes introduce interference, I've experienced it. The thing is, there has to be some mention of the actual circuitry if we're going to state factors and distances as conditions leading to it. Without that there are no real qualifiers.
In general, I agree that switch mode circuits can sometimes introduce interference, I've experienced it. The thing is, there has to be some mention of the actual circuitry if we're going to state factors and distances as conditions leading to it. Without that there are no real qualifiers.
That's right. I measured by square wave PWM voltage in the air.
The closer distance circuit board, the higher the voltage, it is very big.
Shielding inductive voltage slightly lower, toroid is larger.
Note that is measured in the air, no access to the electronic components.
In addition, I also has carried on the electromagnetic tester for measuring, it very large electromagnetic signal.
Under normal circumstances no one noticed it.
I think digital power amplifier to produce these in the air waves, on the human body may have an effect.
May be hurt.
SMPS, I can relate to problematic interference and acoustic noise there. To prevent the electrical noise from being passed on to the circuit being powered, follow up the SMPS with a linear regulator having a high PSRR at frequencies corresponding to those on the line. Anyway, everyone knows that. I wonder if a thin metal shield encapsulating the SMPS' inductor would be enough?
It sounds like ljm_ljm is concerned about the radiated electromagnetic field.
Many people are suspecting electrical, magnetical and electromagnetical fields to impact the health even when the concerned fields of low magnitude.
Scientific examinations in these fields are difficult and of course not just some big companies, but basically all highly developed modern societies have a massive interest in declaring such fields as harmless.
Imagine the hazzle, when we suddenly have to worry about the 50Hz or 60Hz fields due to the normal installations in our houses and flats.
Imagine the hazzle, when we suddenly have to worry about multi GHz waves due to mobile phones,DECT phones, WLAN, Bluetooth, LTE etc...
Imagine the hazzle with induction cooking plates.
Everybody knows the discussion about microwave stoves.
Imagine the hazzle with your computer (fully packed with switch mode power electronics) and TV screens...
Already from scientific view it is a difficult topic to investigate which sort of field may have which kind of influence on the human body, but in combination with business considerations and our human emotions and most people having no clue about physics nor biology there has already evolved an extremely unrational war between people of opposite believes.
Fact is that we usually do not get killed immediately, when using a microwave stove.
Fact is also that we are generating lots of different fields with magnitudes which are significantly higher (often factors of multiple ten thousands) than the natural fields would be in any of the concerned frequency ranges.
Means we have implemented a massive change of our living environment.
ljim_ljim:
How does your field probe look like?
Is it for electrical fields or magnetic fields?
How many V/m or nT do you measure in a certain distance?
Many people are suspecting electrical, magnetical and electromagnetical fields to impact the health even when the concerned fields of low magnitude.
Scientific examinations in these fields are difficult and of course not just some big companies, but basically all highly developed modern societies have a massive interest in declaring such fields as harmless.
Imagine the hazzle, when we suddenly have to worry about the 50Hz or 60Hz fields due to the normal installations in our houses and flats.
Imagine the hazzle, when we suddenly have to worry about multi GHz waves due to mobile phones,DECT phones, WLAN, Bluetooth, LTE etc...
Imagine the hazzle with induction cooking plates.
Everybody knows the discussion about microwave stoves.
Imagine the hazzle with your computer (fully packed with switch mode power electronics) and TV screens...
Already from scientific view it is a difficult topic to investigate which sort of field may have which kind of influence on the human body, but in combination with business considerations and our human emotions and most people having no clue about physics nor biology there has already evolved an extremely unrational war between people of opposite believes.
Fact is that we usually do not get killed immediately, when using a microwave stove.
Fact is also that we are generating lots of different fields with magnitudes which are significantly higher (often factors of multiple ten thousands) than the natural fields would be in any of the concerned frequency ranges.
Means we have implemented a massive change of our living environment.
ljim_ljim:
How does your field probe look like?
Is it for electrical fields or magnetic fields?
How many V/m or nT do you measure in a certain distance?
Digital power amplifier. Radiation bigger than we thought.
10 cm. You can use the oscilloscope, the distance can be very clear, as measured by square wave,
About dozens of V voltage.
Near the inductor is the most obvious. Be careful not to touch it.
I use the electromagnetic wave radiation tester, digital power amplifier is far more than any electrical radiation.
Of course, I don't have it installed in a metal case. Maybe it will be reduced.
The output filter should be carefully designed to get rid of carrier frequency.
The pcb tracks carrying carrier frequency should be as short as possible.
The pcb tracks carrying carrier frequency should be as short as possible.
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