#17 in Car amplifier noise filters
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Reddit mentions of 20 Pieces Clip-on Ferrite Ring Cores, RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter Led Light Radio Static, Black Noise Filter Clip
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Reddit mentions: 1
We found 1 Reddit mentions of 20 Pieces Clip-on Ferrite Ring Cores, RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter Led Light Radio Static, Black Noise Filter Clip. Here are the top ones.
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【Wide Usage】Great for cutting noise on USB, Firewire, Phone, Date line, Car Headlight Cord, Power Cord, Coaxial, AV cable, Audio, HDMI Video etc cables!【Easy to install】Just snap and play! And you will get clearer signal and faster data transmission, Great for blocking RF-interfere;【Superb Function】These snap-on ferrite cores are superb at reducing high frequency interference caused by home appliances and improve signal integrity; Works for Radio static with Led light fixtures on Off Road vehicles;【Package included】20 pieces ferrite cable clips (with 5 different size-3/ 5/ 7/ 9/ 13 mm inner diameter)【LIFETIME WARRANTY】 We Guarantee our customers 100% satisfaction with our high quality of Noise Suppressor. If there are any problems, just email us and get a New Replacement or a Full Refund WITH NO Excuse!
Specs:
easiest quick fix is to add a stack of snap on ferrite cores to it's power cable and your sensitive electronics cords. If that helps, then it was RFI. If it doesn't, then maybe the machine is actually causing surges or something more serious.
eg. https://www.amazon.ca/Pieces-Clip-Ferrite-Suppressor-Diameter/dp/B07DLD2LNW/ref=sr_1_1?keywords=snap+on+ferrite&qid=1556121578&s=gateway&sr=8-1
just search for "snap on ferrite". Get some that fit your power cord.
Other things to check: does a regular incandecent lightbulb on the same circuit as the sewing machine show any brightness variation?
But, this is a problem in the machine. There exist sewing machine repair people even now. If it's a cherished machine, getting it fixed while servicemen still exist is a good idea. You don't want a shock or fire hazard. If it's a newer machine, junk it and replace. New sewing machines come with fancy features, but a shorter service life.