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Winding A Toroid - For Joule Thiefs, etc.

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How to wind a toroid core for joule thiefs and other experiments. The 2 basic ways are explained.

From Wikipedia:
Some bifilars have adjacent coils in which the convolutions are arranged so that the potential difference is magnified (i.e., the current flows in same parallel direction). Others are wound so that the current flows in opposite directions. The magnetic field created by one winding is therefore equal and opposite to that created by the other, resulting in a net magnetic field of zero (i.e., neutralizing any negative effects in the coil). In electrical terms, this means that the self-inductance of the coil is zero.

The bifilar coil (more often called the bifilar winding) is used in modern electrical engineering as a means of constructing wire-wound resistors with negligible parasitic self-inductance.[1]

MATERIALS:
- 1 core (color indicates the frequency range it can work efficiently at)
- Wire


INTERESTING LINKS
Air Core: http://www.circuits.dk/calculator_single_layer_aircore.htm
Resonant Frequency: http://www.deephaven.co.uk/lc.html


OTHER JOULE THIEF VIDEOS
How To Make A Joule Thief - Step by Step
https://youtu.be/IV3lArO0_0U

Tunable Joule Thief:
https://www.youtube.com/watch?v=vli5LIGNlqM

Joule Thief Experiment - Light Switch
https://www.youtube.com/watch?v=L0qZ2ttEe4Q

Joule Thief, No Toroid Coil
https://www.youtube.com/watch?v=g2jMrNFV4nQ

Winding a Toroid
https://www.youtube.com/watch?v=_wvFv4YVYU0

A Mechanical Joule Thief - Is It Possible?
https://www.youtube.com/watch?v=mGvoHc7rFww

Joule Thief PLUS Crystal Radio Equals ???
https://www.youtube.com/watch?v=xn7U16j7IsU
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