Wien Bridge Oscillator

 

• The function of the Wien bridge oscillator is to generator sinusoidal frequency. 
• It is audio frequency oscillator.

Circuit Connection Diagram

• The Wien bridge circuit is connected between amplifier input and output terminal. 

Band Reject Filter OR Band Elimination Filter

 

Band Reject Filter ( Band Elimination Filter ) ( Band Stop Filter )

• It is a filter in which frequencies below lower cut off frequencies and above higher cut off frequencies are passes whereas stop band frequencies are attenuated.

Range of frequencies
f < fL	fL < f < fH	f > fH
Allowed to pass	Not allowed to pass	Allowed to pass

 

In this article, detail study of classification of band pass filter, first order band pass filter, second order band pass filter, wide band pass filter, narrow band pass filter is given.

Band Pass Filter

• The band pass filter allows frequencies to be passed between lower cut off frequency ( f_L ) and higher cut off frequency ( f_H ) whereas it reject all other frequencies below f_L and above f_H.

High Pass Butterworth Filter

In this article, details study of first order high pass Butterworth filter, its frequency response, voltage gain, and second order high pass Butterworth filter is given.

First order High Pass Butterworth Filter

• The high pass filter is obtained by changing frequency determining component – resistors and capacitors in the low pass filter. 

Low Pass Butterworth Filter

In this article, First order Low Pass Butterworth Filter circuit, Second order Low Pass Butterworth Filter circuit, gain of the filter and its frequency response is given.

First order Low Pass Butterworth Filter

• It is a filter which has nearly ideal response, flat passband as well as flat stop band. 
• As both passband and stop band are flat, it is also called as flat – flat filter.

Types of Filter

 Filter

• An electronics filter is a circuit which allows specific band of frequencies whereas blocks frequencies outside of the band.

Classification of Filter

1	Active
2	Passive