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# Sinusoidal Oscillator

An device that generates sinusoidal oscillations of desired frequency is known as a *sinusoidal oscillator.

Although we speak of an oscillator as “generating” a frequency, it should be note that it doesn't create energy, but merely acts as an energy converter.

It receives d.c. energy and changes it into a.c. energy of desired frequency.
The frequency of oscillations depends upon the constants of the device.

It may be mention here that although an alternator produces sinusoidal oscillations of 50Hz, it can't be call an oscillator.

Firstly, an alternator could be a computer having rotating parts
whereas an oscillator could be a non-rotating device.

Secondly, an alternator converts energy into a.c. energy while an oscillator converts d.c. energy into a.c. energy.

Thirdly, an alternator cannot produce high frequency oscillations whereas an oscillator can produce oscillations starting from some Hz to many MHz.

Although oscillations will be produce by mechanical devices (e.g. alternators), but electronic oscillators have the subsequent advantages :

(i) An oscillator could be a non-rotating device. Consequently, there's little wear and tear and hence longer life.

Thirdly, an alternator cannot produce high frequency oscillations whereas an oscillator can produce oscillations starting from some Hz to many MHz.

Although oscillations may be produced by mechanical devices (e.g. alternators), but electronic oscillators have the subsequent advantages :

(i) An oscillator may be a non-rotating device. Consequently, there's little wear and tear and hence longer life.

(ii) Due to the absence of moving parts, the operation of an oscillator is quite silent.

(iii) An oscillator can produce waves from small (20 Hz) to extremely high frequencies (> 100 MHz).

(iv) The frequency of oscillations can be easily change when desire.

(v) It has good frequency stability i.e. frequency once set remains constant for a considerable period of time.

(vi) It has very high efficiency.

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