One of the joys of mobile existence is to regularly reunite with the fruits of various commands sent to friends in the hacker space or somewhere along the way. These anonymous packages from afar carry all kinds of miracles, plus the extra element of anticipation brought about by forgetting exactly what was ordered.

So today’s topic, Mustool MT525 electromagnetic radiation tester. The cost is not much higher than £10 (US$13.70). This is an impulse purchase out of curiosity; these devices claim to measure magnetic and electric fields, but what do they really measure? My interest in these issues lies in the direction of radio, but I have never studied such an instrument. It's time to hackaday it.

The out-of-the-box smart handheld device comes with three buttons, an LCD display, and an instruction manual. On the back of the case is a battery compartment, which requires three AAA batteries. It claims to be able to measure electric fields from 1 V/m to 1999 V/m and magnetic fields from 0.01 μT to 99.99 μT, with a bandwidth from 5 Hz to 3500 MHz. Open the manual, it is obvious that this is used to monitor electromagnetic fields for human safety, which lists various diseases that may cause from leukemia to blindness.

In the free space in this very ordinary house, powering on it will get two zero readings of the measured value, which will increase significantly when approaching various electronic devices. What is particularly worrying is that when any level is considered harmful, the buzzer will sound, and it will sound near a surprising number of items (including the laptop keyboard and trackpad being written to). As expected, the door seal of an operating microwave oven will produce particularly high readings, and the Baofeng handheld transceiver operating at full power in the 430 MHz frequency band can also produce particularly high readings. Unfortunately, my CRT TV is currently in storage, but I expect this will also produce high readings.

The alarm thresholds of this buzzer are 40 V/m and 0.4 μT, respectively. Given that it will sound an alarm on ordinary things such as my keyboard, I have to question what this means. Reading the topic of typical safety exposure levels, it is obvious that the alarm is set too low, and I have to wonder whether this will cause unnecessary worries to people who purchase the device because of personal concerns about electromagnetic field levels. Fortunately, the beep can be disabled by long pressing the button.

So after describing its role, what is inside the case? There are four small screws on the back, which will split into two halves when loosened, revealing a circuit board. The business end of this unit is the sensor, the metal plate used for electric field and the line-side inductor used for magnetism, their output is fed to its own TI TLC27M2 dual operational amplifier. These in turn power the Weltrend WT56F216 microcontroller with 8052 core and analog input, which drives the LCD through the Holtek HT1621 LCD controller. It looks well-designed, and the sensor meets my expectations of a device that measures these properties.

The Mustool MT525 electromagnetic radiation tester. It seems to be a well-designed instrument that can achieve its claimed function and measure the presence and strength of oscillating electric and magnetic fields. But is it a useful instrument, and should I believe it? Does it have space on my workbench? At first I was curious about its calibration. I hardly wanted such a cheap item to have any traceable calibration certificate, but are the V/m and μT numbers within the correct range? I'm also worried about the way it and its devices are sold for health purposes. What worries me is that people may be driven by its "harmful" buzzer to cause unnecessary worry, when in fact they don't need it at all. . As far as I'm concerned, I can report that this is a convenient way to check the field up close, and it works on common amateur radio frequencies, although I can't really claim how useful it is as a desktop instrument. But one thing is very convenient. It detects live power lines buried in walls more reliably than traditional metal detector type wire detectors. Maybe this is where I will use it. However, for your own sake, I bought one so that you don’t have to.

I will put it in a brand new trash can, which already contains a cheap PH meter, a $20 oscilloscope, and a $1 lithium-ion charger.

It can also be used for smart home devices that have terrible security holes, never get updates, and stop working when a backyard manufacturer goes bankrupt.

Yes. More expensive magnetic field sensors seem to have at least one ferrite rod. Use them to check whether scanning electron microscopes will be satisfactory-they are particularly sensitive to unwanted magnetic fields (even on a solid concrete foundation, the weight can jump up and down beside them).

Rather, I want to know how it measures the electric field—assuming it can’t go to DC because it’s not a field mill (just look at the specs—DC is not mentioned).

A kind of tin foil hat wearer.

Oh, a £10 precision wiring detector, home DIYers can use it for many projects. The strange mounting resistance has caused concern, but this may be part of the calibration.

The "strangely installed resistor" is an inductor used to detect the magnetic field.

This makes me wonder if the magnetic field reading will be very directional.

If you know a non-directional magnetic field sensor that can measure RF fields, please let us know.

I have used one to find the source of interference on wifi.

Please note that these identical ones are also sold as ghost detectors. Obviously the price is much higher than the price sold as an electromagnetic noise detector or similar products.

I am disappointed. The ghost detector version requires an arm with amber LEDs that swing in proportion to their readings.

And a small speaker to play Thereman music.

The H field sensor needs to be shielded to distinguish H and E fields. The arrangement shown adds the two together.

I use an oscilloscope with DIY H and E field probes to track EMI sources. Very convenient.

Dave on EEVblog made a video about making them.

"But one thing is very convenient. It detects live power lines buried in walls more reliably than traditional metal detector type wire detectors. Maybe this is where I will use it."

I think most people already have something like this. Mine looks like a thick marker pen with a small nib at the end, and then... *beep*

Also known as "chicken stick"

Not entirely reliable and appropriate name.

I've been an electrician for 15 years, and the only people I've heard who call it a chicken stick are those who are not electricians, or old electricians who don't like working together. Even they usually have one they use.

Use an old phase tester screwdriver to risk your life. A damp resistor then goes out.

This week I used one to diagnose the electric starter on the snow blower to isolate whether the switch or starter motor is faulty. No need to dismantle: just bring the sensor close to the power cord, regardless of whether the switch is pressed or not. Convenient.

If you want to be accurate, do they have any reason to make it a big box instead of a small probe or protrusion with a sensing element? It seems that this design choice will make it less useful as a wiring detector.

Can't you use it to scan for ghosts and other supernatural phenomena? It seems that it is very suitable for the job, as long as it flashes, beeps, and displays some numbers, you can amortize your money from some fools in a few minutes.

Using one of them, you will never catch Egon.

Yes, Egon is a bad a$$, but do you really want to try to quantify the relative field strength by the rotation speed of the Gizmo and the brightness of the light? I mean there is a reason for the LCD. Yes, it looks cool on the camera, but is it practical.

I was thinking about the same thing. Get some stickers that said the official Ghost Hunter EMI Detector made them sick there and sold them for $137.

If the "magnetic field sensor" L3 with such a long lead detects a magnetic field from 5 Hz to 3500 MHz, it may also detect ghost images and gravitational waves.

It may be useful to have an on-site measurement device, although it seems a bit too crude, and I at least hope that any specified accuracy can be guaranteed.

Nevertheless, it is interesting how many people misunderstand the dangers and dangers of radiation. When many people hear the word "radiation", they think of ionizing nuclear-related radiation and produce serious radiation, although this is a stupid conclusion.

I still remember that a research team "discovered" signs that mobile phones have cancer-causing potential, and how researchers advised people not to bring mobile phones close to their bodies.

Anyone with actual knowledge of physics can easily point out the exaggeration and why it is false. (The mobile phone does not emit ionizing radiation, although the body still absorbs some radio frequency, the result is a little hot, although it is easy to generate dozens of times of heat in the palm of the hand, not to mention the muscles. You should stop rubbing your hands or go to the gym Is it just because a little increase in calories may cause cancer?)

Although, it’s not uncommon for people to fear or like/worship what they roughly understand, and they usually study it more deeply for fear of changing their views on the matter, although some people study it more deeply and with confirmation bias Strengthen their arguments/opinions.

An area that has attracted a lot of false myths. In previous reincarnations, I was an EMC/EMI/electromagnetics/SI expert for an international computer company. We set up a special education committee for a major city in the United States. The committee happily purchased many of our monitors and personal computers, and then hired a health expert who persuaded them to expose these little babies to electromagnetic radiation May kill them. There was a meaningless debate with their "health experts" on this issue. His view on electromagnetic fields is that if he can detect electromagnetic fields, then it is dangerous and must be eliminated from the product. The size of the field does not matter to him, so arguing is meaningless. He hopes that electronic equipment will operate without accelerating electrons, which will inevitably generate electromagnetic fields, I don't know. Regarding which topic, has anyone heard of the Karolinska Institute and its decades of exploration to prove that mobile phone radiation is a major health risk?

Of course, there is a very obvious source of electromagnetic radiation in our environment that can cause cancer. This is why you should use sunscreen. Strangely, people who are worried about "electromagnetic hazards" do not seem to be disturbed by the sun, even though it is an unshielded fusion reactor.

It is "natural", like the radioactive sand of Guarapari Beach, used for medicinal mud baths.

Technically speaking, the entire Brazilian coast from Rio de Janeiro to Bahia is filled with the same monsangite sand, which contains uranium and thorium, but people are afraid of some of the tritium in Fukushima.

I don’t think you realize what the atmosphere has done for us, keeping us away from solar radiation.

It can also be used to prove the rationality of the new router to cheap and important others. It is also sold to people with "wifi allergies" at a price.

5Hz to 3500MHz My pin, the input op amp choke quoted is around 1MHz. As for the so-called "design" of the sensor... you can let people buy fake things like this, and this fact confirms that a person is born every minute.

Yes, I would take the liberty to say that the claimed frequency range may *just* be a bit optimistic. If operational amplifiers are used to amplify the detected RF envelope, they are not a problem, but I very much doubt whether the response is flat within the claimed range.

I think the device may be "expensive equipment, which is sold to unsuspecting people who are afraid of their shadow." A group of people suspected that "electromagnetic fields" would cause various symptoms, and they were wearing shielding underwear and the like. If there is a profit, such equipment will meet the "demand."

"According to recent election data, about 50% are or will be fools."

And the IQ bell curve, although most people on the right side of it did not make full use of their talents, because they never acquired the critical thinking and analytical skills.

I believe many people claim that it is harder to find science courses in school and avoid them, because unlike other courses that only require rote memorization, science courses require this skill. If a person has never come into contact with this requirement, he will never learn the skill, and in fact, what we end up with is our national idiot.

Please, people, if you can't exclude politics from HackaDay, can you at least admit the fact that political differences won't make anyone an idiot?

But it picked up 430MHz, so maybe there is a detector.

40 volts per meter alarm threshold? It's best not to go out. The ordinary old sunshine E field is 600 volts per meter. 0.4 uT alarm threshold? Even staying inside will not save you. Earth's magnetic field>30 uT. Of course, it is DC-as long as you don't move in it. Or breathe. Or make your heart beat.

This thing can detect magnetic fields. It has an inductor as a sensor, and the display shows µTesla. That's all legal.

It can be used to detect whether there are wires on the wall before you insert a nail.

It cannot detect electromagnetic radiation.

(In addition, you will never find harmful magnetic field levels anywhere).

Not to defend the accuracy, validity or theft of the device, but to:

The inductor cannot detect the static magnetic field. However, it may generate a voltage signal in the presence of a time-varying magnetic field, which is a distinctive feature of electromagnetic radiation.

The metal plate on the front of the device will detect the electrical potential over time relative to the "ground" of the device (usually a person holding the device). In other words, it is an antenna that detects AC electric fields, and it is also a characteristic of electromagnetic radiation.

Can you explain the basis for your assertion that the device "cannot detect electromagnetic radiation"?

There is a difference between time-varying fields (e.g. from electrical wires) and radiation. One spreads in space, the other does not spread.

If it can be detected at any distance from the wire, outside the fence, etc., it is radiating. You may be in the near field, and coupling to 377 ohm free space may be inefficient, but it is still radiating. If it is an AC field and you can detect it without actually touching the conductor, then it is radiating and propagating.

Put it in a coaxial cable, put it in a Faraday cage, etc., and yes, it does not radiate, but there is nothing to detect.

Do not. "Radiation" has a specific meaning.

Take the classic rope experiment as an example. Tie a rope to a pole from one end, and then place it loosely on the ground. When you raise and lower the free end in your hand, it's like a time-varying field. When you flick the rope up and down, the wave starts to propagate along its length, which is radiation.

In electromagnetics, radiation usually requires self-sustained oscillation through electric and magnetic fields, and local fields can be completely dominated by electric charge or magnetic flux. The electric charge or magnetic flux may change to make it a time-varying field, and it does not mean that this does not mean It must radiate to any significant degree.

The radiation propagates in a space disconnected from the original source. The field does not, although people often say that the field "radiates" when the loudspeaker means it extends in space.

These sensors can receive local electric or magnetic fields very close to sources of considerable intensity, but they do not have effective antennas for actual electromagnetic radiation. They are more likely to simply reject and reflect it because the detector does not match the impedance of the propagation medium.

Hey buddy, just because the coupling may be inefficient, a time-varying electric field always produces a magnetic field, and vice versa. As Paul said, these fields spread with c. The field can be dominated by electrical or magnetic components, but once it changes over time, you will inevitably have both components at the same time. Their ratio is a matter of dielectric impedance.

Once, I was considering using an EMF meter to measure the emission of a high-power radio/television transmitter on the Sutro Tower (26 MW) in San Francisco. The cost of an on-site survey by PE is US$1,500. The cheapest meter is not garbage sold to paranormal believers, but Agilent V3500 (US$2000) or Wandel & Goltermann EMR-300 (US$6000)

"What is particularly worrying is that when any level is considered harmful, the buzzer will make a sound, and it will make a sound near a surprising number of items, including the laptop keyboard and trackpad being used."

I regret that the author does not have two of them to test whether approaching Mustool MT525 will cause an alarm.

"My cancer wave tester can cause cancer!"

She should be fine in the UK. Once one of them enters California, all hells will collapse.

A somewhat topical question: How much do I need to spend to check the Wifi? Well, I mean, the radiation of my microwave oven does not exceed the safe exposure level? I won't believe in a $10 device, but I can't (and won't spend) thousands of dollars. As of today, my microwave oven is safe because I didn’t mess it up (I think it’s built well by default), but let’s assume it’s broken, I want/need to fix it, and make sure it’s still Can it be "saved"? I am not afraid of tens or hundreds of milliwatts from routers (don’t know, I’ve never checked the actual value), but I’m very afraid of high frequency things of hundreds of watts (!).

"...But I'm really scared of high-frequency things with hundreds of watts (!)."

Why? No, really, think about what you are afraid of.

Go for a walk or go to the beach on a sunny day. You will absorb 1 kilowatt (or 100 mW/sq.cm) of energy from the sun per square meter. This will be absorbed in the first half millimeter of skin thickness. This is a power density of 2 watts per cubic centimeter.

Note: At the same time, as a warm body, you are *radiating* about half of the energy into the environment.

Now, compare it with a microwave oven: Disable the interlock, open it, and then stand a metre away and open the door. You will be attacked by radiation up to hundreds of watts per square meter. Or about one-tenth of what you get from sunlight.

In addition, the absorption of microwave energy in your body flesh is much less than that of shorter-wavelength sunlight: you will dilute this energy at a depth of 50 mm instead of 0.5 mm—a further dilution a hundred times. Therefore, the energy you get from the sun is not 2 watts per cubic centimeter, but one thousandth of that of a severely damaged microwave oven (0.002 watts per cubic centimeter). All the while, you yourself are still radiating hundreds of watts per square meter.

So why don't you freeze to death immediately, radiating so much energy? Because your walls, floors, ceilings, and everything else in your environment are also radiating so much energy, you are very close to balance.

Skeptic’s exercise: When you turn on a traditional oven, what is the radiant power on your face?

To paraphrase your words: No, really, think about what you are not afraid of enough.

The problem is not the total power, you are right: sunlight or even temperature heat radiation can achieve a whole body exposure similar to or higher than that produced by a consumer microwave oven.

However, we are not talking about isotropic, uniform irradiation here! Microwave ovens produce complex radiation patterns with a large number of standing waves. Put a dozen small wine glasses with a few milliliters of water in the microwave and observe. Every microwave oven has a rotating disk or rotating internal reflector for a reason.

You will get a large portion of the microwave power concentrated in a few cm3 hotspots. This is several orders of magnitude higher than the power density you can get through sun exposure. Think about using a magnifying glass to roughly focus the sun on your skin.

Next, your estimate of the penetration depth is wrong. The dielectric constant of the tissue varies from a few to dozens. This means that most of the energy can be deposited around the first centimeter. This is why you have to slowly heat up large items in the microwave. You do not evenly heat to a depth of 5 cm or more, and it takes time for the deposited energy to dissipate and heat the food.

The microwave oven accident is not horror story material that some people think (and it is well known that those well-thought-out eyeball stories are incorrect). But they must be the same thing! Play with naked magnetrons as you want, but educate yourself and be careful.

Check out this Wikipedia article, it has a nice layout: https://en.m.wikipedia.org/wiki/Microwave_burn

"Complex radiation patterns with a large number of standing waves" occur in closed microwave ovens, simply because the radiation is confined in a small cavity, and the material that absorbs it is negligible: these patterns are enhanced multiple times by multiple reflections. Caused by reflection. Add an important absorber or allow waves to escape into free space, standing waves simply do not exist.

Of course, "you will not evenly heat to a depth of 5 cm"-this is the working principle of the absorber: power deposition decreases exponentially with depth, and has a material-related characteristic parameter "skin depth". For meat at microwave frequencies, this is 1.5-2 cm. When going down 3 skin depths (approximately 5 cm), 95% of the power has been absorbed.

When the interlocking device or the choke flange fails, consumer microwave ovens will experience accidents. In our target audience, this can also happen when someone decides to take apart the microwave oven and play with the magnetron in an unsafe way.

You can access all situations where the standing wave pattern in the oven cavity or the uneven pattern may be seen due to the short distance.

In addition, you correctly pointed out that the absorption depth will be much smaller than the 50 mm you assumed in the original message, and it will not be uniform over that volume, but will show exponential decay.

In any case, this can easily lead to this not being the case. To quote you, "The energy you get from the sun is not 2 watts/cubic centimeter, but one thousandth of that from a severely damaged microwave oven (0.002 watts/cubic centimeter). ".

The intuition of the power density involved in repairing consumer microwave ovens should not be "one thousandth of solar radiation", but should be "on a sunny day outside, use your eyes to play with a pile of phenanthrene that totals half a square meter. The Neel lens is closed". It may be fine, but it is not difficult to burn.

Please do not tell those who show respect for the health of several 100W microwave transmitters because of lack of professional knowledge, they should not worry, and nothing bad will happen. Tell them to educate themselves and help them do this.

Microwave ovens are not something in the "eyeball" horror story, some people think they are. People can fix them safely, and YouTube is full of interesting and crazy examples. However, accidents do happen, and the medical literature is full of such accidents. Just like there are so many interesting things, if you want to make sure you don’t get burned, you have to know what you are doing.

When you play with those things, there is another great danger: high pressure. 2000V short-term at least 2kW from the transformer can easily kill you. Just be very careful.

Whether it is a microwave oven or your wifi, if you are concerned about the EM level radiated from it, the solution is to put it in a metal box and ground it. If you are concerned about specific frequencies, grids and perforated metal plates (for example in the window of a microwave oven) can also be used. On the other hand, why trust mathematics just for safety and go all out, because if it is for safety, you are a monster of rejection.

"Why should you believe in mathematics [...], if it is for safety, you are a monster of rejection." Of course! For the sake of children! Or you can use Nader altogether instead of owning one.

That's only half Nader. Full Nader is preventing others from owning one.

Ah, yes, Nader should have been prosecuted for crimes against humanity for inciting anti-microwave oven operations and slowing down its adoption, which indirectly caused human disease, suffering and countless deaths.

I tried to put my router in a metal box, but then I couldn't connect to HAD to post the response, so I had to take it out again...

First of all, the equipment is rubbish. Any cheap thing from China is not worth squatting down.

As for your microwave, keep a distance of one meter when cooking hot pockets (which may be worse for your health than eating cardboard), and you can go.

Now, if you want to experience some strange feelings, please work at a microwave relay station equipped with lighthouse tubes and klystrons. It must be one of the most uncomfortable rooms I have ever worked in. In fact, no technical staff will spend time there unless they have to.

There are also high-end systems used by the military. You don't want to be in front when they are launched, but 99.9% of people will never encounter them.

From the perspective of some old military high-power radars, microwaves are not the worst, but strong X-ray emission from high-pressure tubes.

Interestingly, it cannot be calibrated because it has no x, y, z sensors, and nothing classified as a real antenna. For exposure measurement, you also need to convert the measurement field to root mean square power. There are two sensors, one for E-field and one for h-field. This fact is very suitable for direct coupling to cables, etc., making it a beautified cable detector.

I just like the product name "Mu-Stool". Very pertinent.

But certainly not! Polished! "Smart" and "Elaborate Design", she said!

I have an old simulator placed somewhere. It has two sensitivity modes, one for internal pickups and one for external pickups, with a good thin coaxial cable. I picked it up cheaply in real estate sales. The microwave oven I was using was either very good or bad meter, even though it did have fine woven mesh and double door seals around the door. The only place it can pick up things is the grille on the back. However, it seems to receive IF on the radio receiver. In addition, the remote pickup was directional, and I was able to find a light switch that was arcing with it and replace it. It can also detect Bluetooth devices. I messed it up and got bored, but got the impression that it might be useful for finding errors.

Since then, I have seen the same casing, if not the same internal structure as the "Ghost Hunter" device, without external sensors. I don't know if it is a counterfeit of the original version, or if they enter the low-end market when the tool is paid off, or sell it.

Has it passed the FCC RF certification test?

Or... it might just be as simple as a mislabeled/translated product description. There are no accurate numbers available and too late/too lazy to find them. But it may prove to be a useful tool to identify the hazards of EPA (ESD Protected Area), so one can determine whether a particular tool/product can be used or not used in such an area.

@Jenny List said: "It seems to be a well-designed instrument that can achieve its claimed function and measure the presence and strength of oscillating electric and magnetic fields."

Hi. Why do electric and magnetic fields need to oscillate? Put a magnet in front of it to see if it can detect the static magnetic field. Rub a balloon on your head to see if it can detect the electrostatic field. I checked some pictures of the PCB, but I didn't see the diode detector; maybe there is one under the board. Can you provide a front-end reverse engineering schematic? If not, can you send it to Big Clive? thanks.

It needs the magnet to move to induce current in the inductor. Static magnets have no effect on it.

I want such a device occasionally, more out of curiosity than need. Instead, what I have is a device the designer calls Elektrosluch, which is an analog EM field-to-audio converter. They sell them to musicians and audio designers for 100 euros, but the design is open source, and there are schematics and circuit board files on github; I built mine on a strip and installed it in a neon plastic box It was originally a first aid kit from a dollar store. This circuit is basically two copies of an inductor, fed into an op amp—with a gain of approximately 1.3k, enough to run headphones—the inductor is positioned as a stereo output.

Of course, Elektrosluch’s power level is even less informative than Mustool—you can tell by the volume whether one field is stronger than another. If you want a number, you might be able to plug it into a sound level meter, but it Not very precise in nature. Nevertheless, it does provide a quick detection. Many devices are very interesting; I especially like the chord-like sound of a string of WS2812.

Cool item, even though it looks a bit expensive at first glance. A nanoSA or similar interface will help expand its use cases. This will combine intuition with a more technical approach when exploring the EM world.

Generally, the datasheets of these "bus switching" RGB LEDs recommend putting some capacity on the power pins. Even in branded articles, they are often missing.

The frequently used keyword for this thing must be "radiation", which will undoubtedly confuse some first-time buyers who are worried about radiation levels. They hardly know that electromagnetic radiation and ionizing radiation are not the same thing, especially in the Internet shopping business. I believe you will find a large number of incorrectly purchased electromagnetic meters in Japanese homes, and the drawers are full of dust. In Europe and English-speaking countries, people worry that cell phone towers and other terrible sources of "radiation" may also be carefully selected. The target of the product keyword.

A version was constructed not long ago using the EPE plan and the sensor removed from the dead VCR winch motor. It does work, but it is never completely certain why the accuracy is poor. It was later discovered that it lacked a key component to demagnetize the ferrite rod, or it was bent into a U-shape on an original polished iron nail and connected to each side of the sensor with epoxy resin.

In terms of flp, all of this is in the paper I submitted to arXiv as a simple way to verify that my material is indeed superconducting and can be started at >270K. Follow this space! !

My job is to install car audio systems, and I think such equipment may be very useful in this area of ​​work. I currently use an old Walkman cassette player to detect electromagnetic radiation that may interfere with the fidelity of audio, video, or radio signals. If you press the play button when there is no tape in the player and move it close to the wiring in the vehicle, you can hear electromagnetic interference through headphones. I use it when deciding the path to run the signal cable. I also use it when there are too many antenna cables to shorten, and I have to decide what to do with the excess antenna cables.

I would love to buy one for about $13 to see if it is suitable for this application. If that doesn't work, my girlfriend can use it to make sure there is no rubbish in our house. This reminds me of the description of similar devices in her favorite TV show "Supernatural."

Think about how many electromagnetic waves an electric car with orange cables generates! I think most of your interference problems may be ground loops. I found that the complete transformer isolation works like on a stage when working in a 12 volt system. Oops, I even had to use 3 transformers on my portable lithium guitar processor amplifier. In this independent situation, the whine from the switch in the processor is a problem.

AFAIK this orange cable is usually shielded-any chance of receiving radio.

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