# Practical Electronics/High Pass Filter

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## Low Pass Filter[edit | edit source]

### RL Network[edit | edit source]

- 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 | edit source]

- 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 | edit source]

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