# 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 ${\frac {1}{CR}}-{\frac {R}{L}}$  ${\frac {R}{L}}>{\frac {1}{CR}}$