finding type of filter

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sunidrak

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Hi ,

Can anybody plz tell how to find the filter type for a given filter circuit ?
suppose a filter circuit is given how to determine whether its a low pass or high pass or band pass ?? by equation .
 

Usually by determining the gain for zero and infinite frequency, which can be easily read from the circuit.
 

oh ..can u plzz explain how to determine the gain ?? formula ??
regards
Sunil
 

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