An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave. Oscillators convert direct current (DC) from a power supply to an alternating current signal.
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Hydrosphere. The hydrosphere in physical geography describes the combined mass of water found on, under, and over the surface of a planet.Igor Shiklomanov, the man selected by the United Nations to do its world inventory of water resources, estimated that there are 1386 million cubic kilometres of water on earth.ydrosphere. The hydrosphere in physical geography describes the combined mass of water found on, under, and over the surface of a planet.