passive band pass filter

[blair321]

hi there

ive been attemping this question and i cannot find the equation to work it out anywhere !

any help would be great !

for a passive band pass filter

from the following list choose the three components which would produce a cut off frequency closest to 7 khz and a band width of 320 hz

resistor
100 ohm
680 ohm
120 k ohm


capacitor
0.1 nf
10 nf
10 uf


inductor
200 mh
3 mh
50 mh

many thanks

[chroot]

Don't crosspost.

Show us what you've done to get started.

- Warren

[blair321]

my problem is that i cannot find the equation this i what i was asking for
i cannot get started if i cannot find the equation

[chroot]

Where did you get this problem, then? There is no "formula" for a bandpass filter.

- Warren

[blair321]

apologies
i am looking for the resonant frequency and the band witdh

[chroot]

Uh, I gathered that. There still is no "formula" for a bandpass filter. What is the filter topology? I assume there is one R, one L, and one C -- what is the topology?

- Warren

[blair321]

exscuse my ignorance
topology?

[chroot]

How are the components connected together?

- Warren

[blair321]

in series
there is one L, one R and one C

[chroot]

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/serres.html

Do you understand how to find the total impedance of the series combination of the components?

- Warren

[blair321]

to be honest this is all a little over my head
many thanks for your help, but i think its best if i go back to my lecturer tomorrow and ask if he can explain it

thanks again

blair