In this video I help you understand how Common-Mode Chokes work, showing some that you can easily build for yourself.
I also show you how to evaluate the performance of a Common-Mode Choke using a very simple test jig.
IMPORTANT NOTE:
Please note that I use the generic term of "turns" to describe the number of times that I have gone around the toroidal core in this video. In a technical sense, every time the coax passes through the core, it is considered a "turn." Thus, the choke that is pictured in the thumbnail has a total of 10 turns.
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00:05 Introduction Common-Mode Chokes: How do they Work?
00:16 What is the idea behind a Common-Mode Choke?
02:03 CHOKE DESIGN #1: Simply Increasing the Inductance of the outer skin of our Coax
02:27 METHOD #1: Wrap the coax around a ferrite toroid or rod
03:08 THE EXPERIMENT: One Turn at a Time
04:17 OVERALL PERFORMANCE
04:55 METHOD #2: Slide Lots of Ferrite Beads on your Coax
07:08 CHOKE DESIGN #2: Using the Parallel Resonance of your coil of coax
11:24 EVALUATING THE PERFORMANCE OF A COMMON-MODE CHOKE
14:13 Final Comments and Toodle-oots!