Sinusoidal oscillator full details

               SINUSOIDAL OSCILLATORS

Definition:-A static electronic device that produce sinusoidal oscillator of desired                                     frequency called a sinusoidal oscillator.Any circuit that generate an alternating                       voltage is called oscillator.A oscillator is just an electronic device which                                 convert dc to ac required energy.

Advantage of oscillator[also merits]

1. An electronic oscillator has static device it has not rotating parts.

2. The operation of oscillator has silently because they have not rotating part.

3. It can produce oscillation low values to high value.

4. It has much better frequency stability 

Application of oscillator

1. The basic of application of oscillator is to generate waveform of frequency low to high. It is       used in radio receiver.

2. The oscillator is also used all types of transmitter such as radio transmitter.

3. Oscillator are widely is used for testing for electronic equipment.

 Difference between amplifier and oscillator

Amplifier	Oscillator
1. An amplifier produce an  output only when input signal is applied at its input terminal.	1.An oscillator is differ from amplifier. It does not required an input signal so long as dc power source is connected.
2. The output waveform is similar to input waveform but feedback power level is high.	2. The frequency of output signal is controlled by passive component is connected in oscillatory     circuit.
3. The process of energy conservation is  controlled by input signal. If input signal will      be zero than output will be zero.	3. Where as, In amplifier the frequency of output is controlled by input signal.

Types of electrical oscillation

Sinusoidal electrical oscillator is two type

1. Damped oscillation

2. UN-damped oscillation

#Damped oscillation:- The electrical oscillation in which amplitude decrease with time is                                           known as damped oscillation.

#UN-damped oscillation:-  The circuit electrical oscillation in which the amplifier is known                                              as UN-damped oscillation.

Essential parts of a oscillator

1. Oscillator circuit:- An oscillator circuit is also known as tank circuit it is contain                                                  inductive coil[L] and capacitor[C] connected in parallel with each                                          other.

2. Amplifier:- To compensate losses that occur in tank circuit a source of energy is required this source of energy is combination of battery and transistor working as amplifier. The oscillation produce by oscillatory circuit are feedback at the input of transistor amplifier.

3. Feedback circuit:- The circuit is used to feedback a fraction of amplifier output to the oscillatory circuit in correct phase so that it help the oscillation and compensate the losses it provided positive feedback.

Different types of oscillator

A transistor work as an oscillator to produce continuous UN-damped oscillation of any desired frequency.

1. Tunned collector oscillator

2. Hartley oscillator

3. Colpitt's oscillator

4. Phase shift oscillator 

5. Wein bridge oscillator

6. Crystal oscillator

1. Tunned collector oscillator:-

 This circuit contain a tunned circuit in the collector of the transistor of the transistor and hence the name tunned collector oscillator.

Disadvantage:- 

1. Frequency instability, Poor waveform.

2. Induct-or is bulky and expensive.

Apllication:-

1. Widely used to local oscillator in radio recevier.

2. tunned collector oscillator are used as a RC-oscillator circuit,Mixer.

2. Hartley oscillator 

Hartley oscillator is probably the most popular oscillator and is commonly used in radio receiver. It is becouse of its easy adaptability to a wide range of frequency.

    

3. Colpitt's oscillator

Colpitt's oscillator is similar to hartley oscillator the only difference is that in case of colpits oscillator. Coupling is capacities instead of being inductive.

4. Phase shift oscillator

One of the desirable feature of an oscillator is that it should feed back energy of correct phase to the oscillatory circuit to supply the losses. In phase shift oscillator, a phase shift 180 is obtain with a suitable phase shift circuit instead of transformer action.

5. Crystal oscillator

when a constant high frequency is required a transistor crystal oscillator is always preferred 

  Advantage:-

1. As frequency of crystal is independent of temperature, these oscillator have a high order of frequency stability.

2. The quality factor of crystal is very high.

Disadvantage:-

1. Frequency of oscillations cannot be changed if desired.

 

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