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Practical Electronics/Low Pass Filter
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Low Pass Filter
LR Network
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
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
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