firstly, just to point out that I'm not here to burst anyone's bubble or do anyone down.
Quite the contrary, my aim is to supply factual information that can be supported to help people make better decisions about
the health and not get sucked into things that are going to wasting their time or their money
So, the background is we've understood very well the laws that govern magnetic field in coils and electric motors for several hundred years now, and they're very well defined - there is no mystery involved
the equation that governs the maximum magnetic flux you can generate with a coil is represented by
2 x pi x 10^-7× N x I / R.
were
N is the number of turns
I is the current
R is the radius of the coil
in fact, there's even online calculators available now that you can put the parameters of your device into and it will calculate with a high degree of accuracy the maximum field you can generate from a given coil configuration
this means, while I have 20 years experience dealing with electromagnetic devices and a pretty good grasp of the proportionality of effects involved - you don’t have to take my word for anything here –
here's one such calculator
https://www.accelinstruments.com/magnetic/magnetic-field-calculator.htmlit shows if you put in sensible values for the coil described in that article – eg we know the maximum current driving capacity of the tiny amplifier chip that drives a headphone jack = 1milliamp ( 0.001 amps). the specification for the number of turns on the coils in that article is available on the internet - which is 40 turns of 28guage standard magnet wire.
the calculator then calculates is the maximum strength of electromagnetic field you can generate to be 0.0005 milliTesla
screen shot of the calculation using the above calculator here
https://i.ibb.co/dfg79ry/coil-calc.jpgnow compare this to the EMF strength of low to medium intensity PEMF devices supported by studies - which in most studies - is 0.4 up to 10 milli tesla
ref this paper which is a meta analysis of the research on the topic
https://journals.cambridgemedia.com.au/wpr/ahead-print/integrative-review-pulsed-electromagnetic-field-therapy-pemf-and-wound-healingyou can see the output achievable from the headphone jack is an utterly minuscule fraction of anything that would be considered even low level PEMF - even being as generous as possible and using the lower limit of what was described as field strength for low intensity PEMF, this level is –
800 times less field strength than the lowest intensity PEMF described in the studies (0.4/ 0.0005) or almost 20,000 times lower if you use the upper figure(10/0.0005).
to give some context for the proportionality here – the earth’s own magnetic field that we are all walking around in all of the time is in the region of 5 to 10 milli tesla – so low power PEMF is already very low power indeed, compared to the noisy EMF environment all around us all of the time.
Or again as a means of gaining some sense of proportionality – using sound waves as an analogy – 800 times is approximately how much louder a Boeing 747 jet is at take-off vs a mosquito in flight – so imagine trying to hear a mosquito while an airline takes off overhead.
so, while there might well be a guy on a forum or a blog somewhere that says different or that he's measured it, it’s just a nonsense - its apparent from the article that he has a very poor grasp of what he is talking about
– and has likely somehow incorporated some kind of wishful thinking along the way. I would not trust such a person to be able to measure the actual gauss properly.
I’m afraid he has either made a series of errors e.g. with background interference or the decimal point or is quite deluded.
again – Loski - I am sorry if this is unwelcome information -
my intention is only to help provide factually supportable information that can help people make better choices about
their health
please inspect the above workings and sources – this is not something you just have to choose who’s opinion to believe – Rather it’s something that can be easily derived from first principles by anyone with a basic understanding of the simple physics involved.
Note. If you want the field strength in Gauss (rather than Teslas - the Si units) it’s a simple conversion.
Online converter here
https://i-converter.com/magneticfield/millitesla-to-gausswhich shows 0.0005 millitesla is 0.005 Gauss
overall - of all of the alternative therapies out there - i think PEMF / Rife is one of those that is likely to have something to it - but just like anything else - you need to be able to distinguish the real science and real devices - from the simulacrum products that are simply cashing in.