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On Feb 27, 1:10?am, "Dave" wrote:
Need to wind a toroid with a center-tap. Have seen this somewhere, but
can't remember where and can't find it. Anyone know how to easily wind a
tap into a toroid? Am thinking maybe put a loop at that point with a twist
in the wire to keep it from slipping back onto the toroid and loosening
the
other windings. Anybody have any ideas on this?

Besides a bifilar winding, which has already been suggested, try this:

Start at the middle and work towards the ends.

Say you need 10 turns center tapped. Take a piece of
wire long enough for 10 turns, find the exact halfway point,
scrape off the insulation there and make a twist. Then put the twist
on the outside of the core, and wind one end 5 turns one way around
the core, and the other end 5 turns the other way.

Or, use two pieces of wire long enough for 5 turns, Wind the first
one, bring its end out, twist/splice to the second one, wind 5 more
turns.

73 de Jim, N2EY

Gotcha. I am new enough at winding toroids that I am probably going t use
the bifilar winding technique, which seems like it might be more forgiving
if I need to make adjustments afterward (correct me if I'm wrong.) But I
understand what you are saying here, and appreciate your input. Thanks
much. Once I get more adept this is what I will do.

Dave