The filter consists of two
fourth -order sections in
series. Various components
in the second section have
been given two different values.
The non-bracketed values
are used if IC(1b) functions as
a voltage folIower; R11 is then
replaced by a link and RI2 is
omitted. The values in brackets
are for use If IC(2b) is used
as a x2 amplifier: R11 and R12
are then equivalent.
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