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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What the Biosphere Is. The biosphere is the fourth sphere, and consists of the places where life can be found. Since life exists in the air, on and in the earth, and on and in water, the biosphere overlaps, connects, and influences all of the other spheres - and they all affect the biosphere. Considering the sheer number of organisms on earth, however, the biosphere is actually fairly small in size.