(Pack of 20pcs) Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter Cable, Black

I am an amateur radio operator (ham), installed a new antenna and was knocking the picture off of the television on 20 meters when running high power (approximately 900 watts.) I installed a couple of these on the power cord of the set top box, and it instantly cured the problem. No more TVI problems! I was also having some pretty severe hum coming from my computer speakers and subwoofer on 15 meters (21.0 Mhz.). I installed one each on each speaker lead and power cord and hum cut down 50%, added one more to each speaker cable and power cord and hum is 100% gone now! Wide assortment of RFI chokes in package, very easy to install and very competitively priced.

My Ender 3 V2 display began making noises and jumping around the menus after I installed LED lighting in its enclosure. A little research indicated that many people had seen similar behavior with all sorts of RF noise sources across the entire Ender line. I initially added these ferrite beads to the outputs of the LED ballast; however, that was insufficient to eliminate the issue. Adding them to the inputs and the outputs was successful. It's possible the actual noise source here is the AC/DC transformer rather than the LED ballast, but I'm not going to mess with success at this point - especially not for how little these cost. I've since added them to both ends of the LCD cable and am considering adding them to the stepper motor cables since those are known to produce RF noise that interferes with the thermistor. I will keep this product on hand all the time now.

Wifes monitor located in another part of house caused static on the ham radio. Installed these on the monitor and wallah, noise gone. Thanks!

I was freshening up my audio connects for a streaming setup, and I was tracking down some bad ground loop hums and interference. I used an active ground loop isolator and I will say that did a majority of the work... HOWEVER, after installing probably ten of these little guys on different wires in my setup, I did notice some extra noise suppression, to the point of being nearly inaudible to me and inaudible over a stream/podcast scenario. Big improvement with respect to the money/ product type, just don't expect miracles. the clasps will take some repeated open/close cycles unlike crappier ones which was kind of nice. one tip: when possible, make the cord end "wrap" around the ferrite magnet so you get two passes inside the magnet, this makes them work just a tad bit better. I usually do this for 3.5mm jacks, and small gauge usb power cords but obviously its hard with larger mains power cords or ethernet cords.

I tried using these on a cell phone charger cable that was causing interference with my car radio. I tried to use multiple sizes and 3 or 4 on a single wire and it made no difference. They seem like good quality but just didn't work. I've tried a dozen different cables and nothing seems to help.

I had been using a dongle for my 2011 MacBook pro to connect to an Apple LED Cinema Display, and I had to wrap the cord of the dongle in foil so that it would not interrupt my wifi connection for the past few months. I was so glad to tear that foil off today and replace it with the ferrite. The results are instant. No more issues with the wifi connection when connecting to the monitor and it is so much more pleasing to the eye than foil! I received all 20 pcs, 4 each of the 3 larger sizes, and 8 pcs of the smallest size. They weigh more than I expected which speaks to their quality. They are also super easy to clip on. Very happy with this purchase :)

I finally got around to the antenna reaiming project. I was positive that I had interference plus the antenna needing adjustment and I was correct. I aimed the antenna using the app found on the Play store, then tested. Still could not get Fox network to show any picture, although it was detected. Used the ferrite traps and now Fox is clear. Even gained another channel. The interference has cut certain stations at certain times of the day for a long time, every station stayed on today. And now I have plenty of ferrite traps for any electronics that have issues in the future. These are a great value, and even if they don't 100% solve your problem they are far cheaper than having a technician come to your house to check things for you.

These things are useless. Purchased to reduce alternator whine from an aux cord (yes some of us still driving vehicles that have an aux input). After trying several different methods (loops, straight through, even five installed on a single line, even tried using them on the power cord connected to the device) these things did nothing to reduce the whine. Do not purchase unless you’re just looking for a paper weight.

PRODUCTO DE CALIDAD 100% RECOMENDABLE

Tengo un zumbido en Dios subwoofer polkaudio y no lo soluciono, la solución fue cambiar el cable de audio por cable coaxial.