Practical Electronics/Band Pass Filter

Band Pass Filter

Band Pass Filter can be constructed from joining Low Pass Filter network with High Pass Filter network . Therefore, Band Pass Filters can be constructed from joining

LR and CR

RC and RL

Band Pass Filter LR + CR

Band Pass Filter LR + CR has a stable voltage over a band of frequencies from $\frac{R}{L}$ to $\frac{1}{RC}$ as long as

$\frac{1}{RC}>\frac{R}{L}$

$R<\frac{L}{C}$

Band Pass Filter RC + RL

Band Pass Filter RC + RL has a stable voltage over a band of frequencies from $\frac{1}{RC}$ to $\frac{R}{L}$ as long as

$\frac{R}{L}>\frac{1}{RC}$

$R>\frac{L}{C}$

Summary

In general Band Pass Filter can be constructed by joining

1. RC and RL that has a band pass from $\frac{1}{RC}$ to $\frac{R}{L}$
2. LR and CR that has a band pass from $\frac{R}{L}$ to $\frac{1}{RC}$

bhar main ja

Filters	Band Pass	R,L,C 's Value
LR - CR	$\frac{R}{L}-\frac{1}{CR}$	$\frac{1}{CR}>\frac{R}{L}$
RC - RL	$\frac{1}{CR}-\frac{R}{L}$	$\frac{R}{L}>\frac{1}{CR}$