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 term Sinosphere is sometimes used as a synonym for the East Asian cultural sphere. The etymology of Sinosphere is from Sino-China; Chinese (cf. Sinophone) and -sphere in the sense of sphere of influence, area influenced by a country.