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CW_FILTER

2017-02-21 18:26  
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CW_FILTER
Simple single-section parallel-tuned active filter uses negative-impedance converter or gyrator to replace hard-to-get inductor of passive code filter. Capacitor CL is gyrated from 0.0332 ptF to effective inductance of 1.87 H. Filter has 6-dB gain at resonance and essentially zero output impedance. Bandpass is 85 Hz centered at about 865 Hz. Uses single -12 V supply. Resistors R are 7.5K, matched to about 2%.-N. Sipkes, Build This CW Filter, 73 Mag-azine, June 1977, p 55.