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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  Biosphere-any part of the earth that contains life. Lithosphere-outer solid part of the earth including crust and upper mantle Hydrosphere-the part of the eart â¦ h made up of water Atmosphere-the layer of gases surrounding the earth that are contained by gravity.