What is this?

BatteryCharger

Flashlight Enthusiast
Joined
Jun 5, 2003
Messages
1,587
Location
The crazy guy next door
I'm going to use a Dell laptop power supply as a bench supply with an LM317 regulator. On the end of the cord, about 2 inches before the tip there is a big "thing". What is this? I see it on alot of electronics cords.
plug.jpg
 

enLIGHTenment

Enlightened
Joined
Feb 5, 2005
Messages
814
Location
Ottawa, Canada
It's a ferrite core interference filter. It's to block radio frequency electrical noise from escaping from the computer and radiating from the cable. This is to prevent radio interference in the immediate area.
 

PhotonWrangler

Flashaholic
Joined
Oct 19, 2003
Messages
14,358
Location
In a handbasket
What EnLIGHTenment said! You'll sometimes see those on the ends of VGA cables, AC power cables, etc. They also call them ferrite chokes because they choke off the EMI/RFI.
 

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