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''For synth filters see [[Voltage controlled filter]].''
{{for|synthesizer filters rather than electronic filter circuits|Voltage controlled filter}}

In electronics the most basic '''filter''' circuits are the CR high pass and RC low Pass filters. The high pass filter removes DC and low frequencies and the low pass removes high frequencies.
In electronics the most basic '''filter''' circuits are the CR high pass and RC low Pass filters. The high pass filter removes DC and low frequencies and the low pass removes high frequencies.
[[File:High_pass_filter.svg|thumb|right|300px|The high pass CR filter. A two port network.]]
[[File:High_pass_filter.svg|thumb|right|300px|The high pass CR filter. A two port network.]]