resonance in a LCR series

Helix · 4th February 2002, 11:47 PM

URGENT HELP REQUIRED!

I have a LCR series circuit, i have the following problem finding the Q.
F=resonant req
B=bandwidth

I thought the Q = F/B

where B = R/(2*pi*L)

my inductor is 68mH
capacitor = 2.2uF
Resistor = 100Ohm

so i found resonance at 411 Hz

But i calculate Q to be 1.75? shouldn't it be about 0.7?

Helix · 5th February 2002, 12:00 AM

sorted!
i fergot to add the DC resistance of the inductor (it's about 150ohms or so), perhaps it's time for another cup of coffee!

4th February 2002, 11:47 PM	#1
Helix diyAudio Member Join Date: Jul 2001 Location: UK	resonance in a LCR series URGENT HELP REQUIRED! I have a LCR series circuit, i have the following problem finding the Q. F=resonant req B=bandwidth I thought the Q = F/B where B = R/(2piL) my inductor is 68mH capacitor = 2.2uF Resistor = 100Ohm so i found resonance at 411 Hz But i calculate Q to be 1.75? shouldn't it be about 0.7?

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5th February 2002, 12:00 AM	#2
Helix diyAudio Member Join Date: Jul 2001 Location: UK	sorted! i fergot to add the DC resistance of the inductor (it's about 150ohms or so), perhaps it's time for another cup of coffee!