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Index

Changelog 18/1/21 Minimalist Duelund crossover page updated. 15/2/21 Darlington 5 page updated.1/3/21 PW12-12 amplifier page updated. 21/3/21 Tunable 3rd order rumble filter page added. 5/4/21 Second order S&K filter page added. 26/4/21 Guy Martins WW1 tank page updated. 23/5 21 Precision cost effective crossover page added. Single op-amp 4th order low pass/high pass page update.