Read e-book online Applied electronics : a first course in electronics, PDF

By Truman S. Gray

A uncomplicated textual content protecting the actual phenomena fascinated about digital conduction; ways that those phenomena mix to control the features, rankings, and obstacles of digital units; and functions of electronics to some of the branches of electric engineering.

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Extra info for Applied electronics : a first course in electronics, electron tubes, and associated circuits

Example text

Cathode Deflection plate pair A 2) 14. Fluorescent screen 15. Getter 13. A 3 terminal 16. Ceramic gun supports 17. Mount support spider 18. Deflection plate structure support tube are as illustrated in Fig. 5. They comprise: (a) a source of elec­ trons, usually a heated cathode ; (b) an arrangement of electrodes termed an electron gun, which serves to attract the electrons from the cathode, to focus them into a fine pencil or beam of rays, and to project them from the cathode down the maj or axis of the tube (hence the name cathode ray); (c) an arrangement of electrodes called de­ flecting plates, or of coils, as is discussed in Art.

Uniform Field; Initial Velocity in the Direction of the Field. In some electronic devices the charged particles cannot be considered to start from rest at the cathode. Consideration of the initial velocity at the cathode is required, for example, in an analysis of the motion of an electron in a vacuum diode, as discussed in Ch. II, or in a multi­ electrode device in which an electron set free at one electrode acquires a velocity by moving through a potential difference between one pair of electrodes and then enters the electric field between two other electrodes.

Anode (p) _ - - -- L Electron -- _ _ - - --- _ _ - -- - --_____ -- -- Screen ( s ) -��� Yp 'd Y- - - - - __ ----- _ _ R __ S - - -I _ \\ I I ds U Electrostatic deflection i n a cathode-ray tube. between the deflecting plates d, the region beyond the gun is essentially field free by virtue of the shielding effect of the metal container or of a conducting film on the inside of the glass container. The electrons then pass down the axis of the tube through the field-free space and strike the screen 8 at the point R with substantially the velocity they had on leaving the gun.

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Applied electronics : a first course in electronics, electron tubes, and associated circuits by Truman S. Gray


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