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8th order Bessel filter

8th order Bessel filter
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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