Reddit reviews Ferrite Core 1/2 Cord Noise Suppressor

If you can find ferrite core noise suppressors in a large size that would work

A ferrite core noise suppressor, clip it around the power cord to help stop electrical noise getting back into the power supply.

http://www.amazon.com/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK

One thing that can definitely help reduce EM interference is a ferrite core on the power line of your router. This should keep the interference from being conducted down the power line and interfering with the router's power and ground circuits.

There are lots of people who believe (rightly or wrongly) that electromagnetic interference has medical effects on them, and so there's a whole cottage industry of products you can buy to do grounding and isolation of two components from each other. Some of these are bollocks, some are snake-oil, but some of the items can actually work to block RFI.

Your challenge will be blocking the RF energy from the unshielded motor without smothering the WiFi signal you want to leave intact. I would say you could sew a "vibrator cozy" out of conductive fabric; slip the Hitachi into the sleeve then put the whole thing inside a condom (or female condom) to make it easy to clean. This will make it heat up faster, so you'll want to watch out for long sessions (if you have "long sessions" with a Hitachi, holy shit, what are you doing?) because the motor could overheat and possibly melt some of its own components.

You need a ferrite core: Amazon Link

Wrap the main speaker wire around it twice...usually doesn't matter where, but in the middle would be good.

Yes, ferrite beads will help. Place them on the power (mains) cable as well as any speaker wires. Something like this should work.

My wife had a similar problem with her computer speakers at work. They were picking up a nearby radio station.

The easiest fix is to use a ferrite core. I bought ones similar to these and they fixed her problem.

Assuming you have the cord length buy one with a hole wider than your cord and wrap it a few times though the ring. Do it towards the middle of the cord length.

If you don't have the length for loops buy one that is the same size as your cord and put it near the middle.

Is this an AM radio station, or FM? I'm guessing AM.

Based on the clues provided, it seems the transmission is being picked up via the wires going to the speakers.

I would try getting a couple round ferrite cores, and running the speaker wire through them a couple times kind of like this:

http://owenduffy.net/blog/?p=713

Here is something similar, check the review by SpaceFuzz:

http://www.amazon.com/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK

https://www.amazon.com/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK stick one of these on the cable

provided the cable is external. Don't stick it on an internal one.

Make sure the the LEDs have a low path of resistance back to the batter and maybe try to use some ferric core noise suppression on whatever line you're picking up the noise, something like these may work. Where or on what system are you experiencing the noise/interference?

You could also try getting better cables (better sheilding) on whatever is getting the noise or you could put the LEDs on a separate battery.

They don't need fancy cables, they need ferrite beads to filter out RF interference https://www.amazon.com/Parts-Express-Ferrite-Noise-Suppressor/dp/B0002MQGEK

or like, don't put your phone next to any recording equipment (the dumb broads on Red Scare are particularly guilty of this)

Two ferrite beads clipped onto the speaker wires would be most ideal, right at the back of the speakers. The clip-on versions simply hinge open, you wind the speaker wire around one half of the open shell, about 2 or 3 times, then snap the shell shut.

These are known as a noise or interference suppressor, and the job they do is to block high frequency allowing audio signal through.

You hear radio signals because the long leads of your speakers are an antenna, the amplifier in the speakers makes it loud enough for you to hear.

You can wind the extra wire to your speakers into a small coil to make it more of an inductor, but the suppressors are the answer.

Try getting a ferrite core for the cord and see if that cuts down on the interference.

Something like this.

Try a huge ferrite core.

Can be found on most mass produced noisy circuits.

Or amazon https://www.amazon.com/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK

Sounds like interference from a wireless antenna (likely cell phone), specially if the machine was truly in standby when the sounds/flickering happened.

Install Ferrite Cores at both ends of the speaker connections as well as the mouse cable to absorb errant RF signals and see if the situation improves.

Example of the ferrite choke others have mentioned:
Ferrite Core 1/2 Cord Noise Suppressor

Your power cables are probably picking up a radio station. The white noise (hiss) is normal for those speakers.

Measure the diameter of the power cord and buy 4 of the appropriate size (two for each cable, one at each end):

https://www.amazon.com/gp/aw/d/B0002MQGEK/

Also this should go in the Tech Support Sticky/Thread. Rule 4 of the subreddit.

See if a clip on ferrite bead around the wire helps.

http://www.amazon.com/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK

Have you tried one of these? https://www.amazon.com/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK/ref=sr_1_1?s=pc&ie=UTF8&qid=1480640780&sr=1-1&keywords=ferrite

I'd just try a ferrite choke. The ones that snap on are pretty easy to install.

https://www.amazon.com/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK

Have you tried a Ferrite Core? Assuming you have enough power lead.

https://www.amazon.com/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK

https://images-na.ssl-images-amazon.com/images/I/61o7Pw9-umL._SL256_.jpg

> There's no reason my keyboard should be outputting a radio signal

Nope, you're right, there's not. Unfortunately RF radiation and interference standards are lax these, and everyone wants to produce everything as cheaply as possible. The keyboard probably doesn't even have a shielded cord... and if it does, it probably doesn't have a choke. Try slapping a couple of these on the cable: https://www.amazon.ca/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK ...but chances are, whatever circuit board and switching they put in the keyboard probably isn't properly shielded either, so it might not help.

None of this even takes into account the lacking shielding inside the amp or guitar cavities. TL:DR; you might just have to live with it if adding some shielding doesn't help

This. The underlying/background ...hmmmmm... sounds like 60Hz hum, but the scratchy intermittent glitching isn't. If you live in the Northern hemisphere, Winter static (dry air, etc) can be a player. Word on the street is that dryer sheets rubbed on your cables can help reduce it, I'm not 100% sold, but it's easy and cheap to try.

Also, for the hum, you may want to look into a Ferrite Core style noise suppressor if your power-cable doesn't already have one.