Science Friday: Earth is a giant iron magnet

Earth is a giant iron magnet

Earth’s core is solid iron.  Around this inner core is a layer of liquid iron. The interaction between the liquid and solid iron is responsible for generating electrical currents and a powerful magnetic field.  The magnetic field is in alignment with the Earth's rotation and extends all the way into space.

Good DX and 73, NJ2X

Study of celestial phenomena...

The study of celestial phenomena at radio wavelengths, radio astronomy came into being after the accidental discovery of cosmic radiation by radio engineer Karl Jansky in 1933. -- Honor Harger

The ocean is made of waves...

An ocean traveller has even more vividly the impression that the ocean is made of waves than that it is made of water. — Sir Arthur Stanley Eddington

Notably to electrons...

After long reflection in solitude and meditation, I suddenly had the idea, during the year 1923, that the discovery made by Einstein in 1905 should be generalised by extending it to all material particles and notably to electrons. — Prince Louis-Victor de Broglie

Prince Louis-Victor de Broglie

Who invented ferrite?

Who invented magnetic core material known as ferrite?

• Dr. Takeshi Takei from the Tokyo Institute of Technology, discovered zinc and iron oxides have special magnetic properties.
• Professors Kato and Takei applied for a patent in Japan in 1930 for their discovery of oxide magnetic core materials which was granted in 1932.
• Tokyo Denki Kagaku Kogyo (now known as TDK Corporation) was founded in 1935 to commercialize ferrite cores.  TDK is still making ferrite cores today.
• Philips applied for a patent in The Netherlands in 1941 for ferrite.

Ferrite Bead

Good DX and 73, NJ2X

What is the schematic symbol for a ferrite bead?

This is a ferrite bead.

Ferrite Bead - through the hole variety

So, what is the schematic symbol for a ferrite bead?

According to the IEEE 315 standard for Graphic Symbols for Electrical and Electronics Diagrams, the ferrite bead schematic symbol is:

IEEE 315 Ferrite Bead Schematic Symbol

Additionally, there are several other ways commonly used to denote a ferrite bead on a schematic:

Ferrite Bead

Ferrite Bead

Ferrite Bead

Ferrite Bead

Good DX and 73,

NJ2X