How to determine Q from a graph?

[JoeBob]

I've got a graph plotting the amplitude of a signal with respect to frequency. It's just a simple bandpass RLC circuit. My question is how do I determine the Q of the circuit if the value of the resistor is unknown? I just can't remember how, a quick jog of my memory should be all it takes. Thanks...

 

[Sch3mat1c]

Something to do with width of the -3dB passband, for sure...

I don't remember what the figures are. If I ever knew.

Tim

 

[Bill Fitzpatrick]

I don't know why we have to perform the google searches for you.

http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/experiment/lab/expt3/expt3.html

 

[JoeBob]

Well, I did do a google search, I guess I just didn't search for the right keywords. Thanks alot for the link though.

 

[Bill Fitzpatrick]

Stick this in your library of google search hints.

"circuit q" rlc