Practical Electronics/High Pass Filter
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Low Pass Filter[edit]
RL Network[edit]
 Plot three points above we have a graph . From graph, we see voltage does not change with frequency on High Frequency therefore RL network can be used as High Pass Filter
CR Network[edit]
 Plot three points above we have a graph . From graph, we see voltage does not change with frequency on High Frequency therefore LR network can be used as High Pass Filter
Summary[edit]
In general
 High Pass Filter can be constructed from the two networks RL or CR network .
 High Pass Filter has stable voltage does not change with frequency on Low Frequency .
 High pass filter can be expressed in a mathematical form of

 T = RC for RC network
 for RL network