Rick wrote:
I had so much trouble burning up baluns back in the 80s that I have
switched to using only Teflon insulated wire for my chokes and baluns.
Baluns don't normally burn up because the insulation isn't
adequate. Rather, they burn up because the common-mode current is
higher than the core size and mix can tolerate (or, much less
frequently, because the wire used is too small). Overheating is a
symptom of too small a core, the wrong ferrite mix for the
frequency(ies), too few turns, and/or too small a wire gauge. There
is lots of information on the web. When in doubt, use a bigger core
(after making sure you are using the right ferrite mix for the
frequency, sufficiently heavy wire to handle the power, and enough
turns to get the common-mode impedance that you need).
Best regards,
Charles
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