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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The biosphere (from Greek Î²Î¯Î¿Ï bÃ­os life and ÏÏÎ±á¿ÏÎ± sphaira sphere) also known as the ecosphere (from Greek Î¿á¼¶ÎºÎ¿Ï oÃ®kos environment and ÏÏÎ±á¿ÏÎ±), is the worldwide sum of all ecosystems. The two joined words are bio and sphere.