F. H. Richardson's bluebook of projection (1935)

Page scan 000557 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000557
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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THEORY AND WIRING OF AMPLIFIERS 539 circuit. The strength of the current depends on the number of emitted negatrons that reach the anode, and hence upon the voltage across the tube and upon the strength of the emission. Next, consider the grid circuit. It has two wires, like any other. One wire goes to the cathode, one to the grid. Cathode and grid are a small condenser; that is, two conductors separated by the insulation of the vacuum. The grid is kept always negative with respect to the cathode (how this is done is explained on Page 552), hence, negatrons cannot contact the grid and shortcircuit the grid-cathode capacitance. The grid circuit consists of two wires, its "load" is a tiny condenser ; its source of power is the only unusual /i.e. GENERATOR BATTERY CONDENSER Fig. 127. — The electrical equivalent of a grid circuit. thing about it. There are two sources of power, connected in series. One is the source of sound current to be amplified. This may be the secondary of a transformer, as in Figure 128. The other is plain d. c, wired negative to grid and positive to cathode, and called the grid (or "C") bias; it keeps the condenser always charged with cathode positive and grid negative, while the sound source in series varies the strength of that charge as its own strength and frequency change. The essential electrical characteristics are diagrammed in Figure 127. These two circuits, grid circuit and plate circuit, are