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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Extensive Definition Ecosphere has several different meanings: In ecology the term ecosphere can refer to the global ecosystem of the planet (essentially the same as biosphere). In astronomy an ecosphere is an imaginary shell of space surrounding stars where conditions are such that life might survive. See habitable zone. Ecosphere (science) is a closed ecosystem useful for learning about ecology, available as a novelty gift, such as a terrarium