. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. CONSTANT FREQUENCY OSCILLATORS 81 impedances to cause the frequency to be independent of changes in battery voltages. In Fig. 11 the stabilizing impedance is placed be- tween the plate and the tuned circuit; in Fig. 12 between the grid and coupling coil; and in Fig. 13 stabilization is accomplished by imped- ances placed in both positions. Again, the mathematical analysis gives the values of the stabilizing impedances as shown on the figures and indicates that oscillat
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. CONSTANT FREQUENCY OSCILLATORS 81 impedances to cause the frequency to be independent of changes in battery voltages. In Fig. 11 the stabilizing impedance is placed be- tween the plate and the tuned circuit; in Fig. 12 between the grid and coupling coil; and in Fig. 13 stabilization is accomplished by imped- ances placed in both positions. Again, the mathematical analysis gives the values of the stabilizing impedances as shown on the figures and indicates that oscillation is possible when these values are used. Other Types of Oscillator Circuits As an instance of the stabilizing of another general class of oscillator circuits which has wide application in a number of special cases, atten- tion is drawn to the tuned-plate, tuned-grid circuit of Fig. 14. The. Fig. 14—Tuned-plate, tuned-grid oscillator with no magnetic coupling. L-,r ^ . {l+n)C,C, Ci --rl'^'^ C, + (1 +n)Cs ]-a. input and output circuits are shown in the drawing as consisting of condenser and inductance combinations connected in parallel. At any specified frequency, however, the parallel combination may be replaced C3 r-ih-, 1 4 1 Z2 m Ci = zz o C5< ezz zza Zl 1 Fig. 14-a. by a series circuit, or, in fact, by any form of network which has the same impedance, and none of the currents or voltages in the remainder of the circuit will be altered. In particular, the inductance and capac- ity shown on the input side in Fig. 14 may be replaced by a piezo- electric crystal, as shown in Fig. 14-a, having the same impedance at. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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