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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geosphere, lithosphere-the solid part of the earth consisting of the crust and outer mantle. crustal plate, plate-a rigid layer of the Earth's crust that is believed to drift slowly. sial-the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum.