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

 T = RC for RC network
 for RL network