Abstract
VALVE oscillators and selective amplifiers, in which tuning is carried out by a combination of condensers and resistances, have been developed in recent years and provide means of obtaining sinusoidal oscillations of low as well as high frequency.
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ROBERTS, N. Resistance-Capacity Tuning. Nature 143, 639–640 (1939). https://doi.org/10.1038/143639b0
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DOI: https://doi.org/10.1038/143639b0
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