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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Definition: Mediastinum. The mediastinum is the area in the chest between the lungs, that contains the heart, part of the windpipe (the trachea), the esophagus, and the great vessels including the ascending aorta and right and left pulmonary arteries -- essentially all of the organs in the chest except the lungs.