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Old October 4th 18, 10:03 PM posted to sci.electronics.repair
Terry Schwartz Terry Schwartz is offline
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First recorded activity by DIYBanter: Dec 2017
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Default Can I remove the choke?

If you want to restore the functionality of the original "choke" which is actually a ferrite bead, you'd need to find the equivalent of the original part. And it's not like they are marked.

Just cut it off, it'll work fine. Those are placed on there to meet regulatory requirements. The radiated emissions levels from common equipment are very low, and the susceptibility of adjacent equipment is very good. You'll have no issues.

I spent several years running an EMC lab. I had a hand in putting those ferrites on many pieces of equipment, not to solve a real problem, but to get the equipment to comply with regulations. There were a very few cases where the ferrites were installed to solve a susceptibility problem, one that happened at ridiculously high field strengths in every case.


On Thursday, October 4, 2018 at 3:15:21 AM UTC-5, Clifford Heath wrote:
On 04/10/18 17:48, wrote:
I have an older laptop PC. It has a inline transformer. In other words,
the transformer is between the wall plug and the PC. The little plug
came off where it plugs into the PC. I have some of those plugs, but
there is not enough wire between a cord choke, that is right at the end
of the cord by the PC. It's molded on the wire so I cant move it.

What would happen if I just remove it and put my plug on without that
choke? What are those chokes for anyhow? I can understand them on video
cords and so on, but why are they needed on a power cord?

If I can install my plug without the choke, I will, and that will only
be for a short time. I bought a new cord on ebay, but I use that
computer all the time and dont want to wait till I get the ebay one.
After that, the repaired one will only be a backup cord.


The choke tries to kill EMI coming out of the computer.
Cut it off, and buy a snap-on one to go over the finished cable.

Clifford Heath.