. The Bell System technical journal . ties is shown in Fig. 64, the output beingtuned instead of the input. 51. Colpitis and Hartley Circuits. Two very similar types of circuitswhich have proved satisfactory for a wide range of frequencies, voltagesand powers, and which yield very high efficiencies, are shown inFigs. 64 and 65, the former being known as the Colpitts and the latteras the Hartley circuit. In both circuits, as illustrated, the mean gridpotential is secured by a grid leak. The blocking condenser Cgshould be large enough to offer very little impedance to the flow ofthe alternating
. The Bell System technical journal . ties is shown in Fig. 64, the output beingtuned instead of the input. 51. Colpitis and Hartley Circuits. Two very similar types of circuitswhich have proved satisfactory for a wide range of frequencies, voltagesand powers, and which yield very high efficiencies, are shown inFigs. 64 and 65, the former being known as the Colpitts and the latteras the Hartley circuit. In both circuits, as illustrated, the mean gridpotential is secured by a grid leak. The blocking condenser Cgshould be large enough to offer very little impedance to the flow ofthe alternating current which causes the variation of the grid potential, 90 BELL SYSTEM TECHNICAL JOURNAL and as seen in Fig. 61 the resistance of the leak can be varied withinwide limits without an appreciable effect upon the performance of thecircuit. The source of plate potential may be either battery orgenerator. The choke in the generator supply should be sufficientlylarge to prevent an appreciable amount of oscillating current flowing cgf ?Rg. Fig. 64 Cgy
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