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