Vo was very ringing but once i add r1 to the circuit vo was squrae wave and was ok so how r1 clear the ringing

 

Hello,

The resistor R1 will reduce the Q of the tuned circuit.
If the Q is to high you will experience the ringing.

Bertus

 

Hello,

The resistor R1 will reduce the Q of the tuned circuit.
If the Q is to high you will experience the ringing.

Bertus

thanks ,but how can i measure the Q

 

Hello,

You can read about the q-factor in this wiki article:
http://en.wikipedia.org/wiki/Q_factor

Here is some more theory about the relation between the Q-factor and Damping-factor:
http://en.wikipedia.org/wiki/RLC_circuit
http://en.wikibooks.org/wiki/Circuit_Theory/RLC_Circuits

Bertus