The oscillator is used to generate repetitive electronic signal ( usually a sine wave or square wave ) electronic components. It forms a circuit called oscillation circuit. To convert a direct current into an AC signal with a frequency output of the electronic circuit or device. Many species, according to the oscillation modes can be divided into a self-excited oscillator, he excited oscillator; the circuit structure can be divided into capacitance resistance oscillator, inductance and capacitance oscillator, crystal oscillator, fork oscillator; the output waveform can be divided into sine wave, square wave, sawtooth wave oscillator. Widely used in the electronics industry, medical treatment, scientific research and so on.
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