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ADJUSTABLE_400_CPS_TUNING_FORK_FILTER

2017-02-23 15:03  
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ADJUSTABLE_400_CPS_TUNING_FORK_FILTER
Tuning-fork frequency is adjusted by varying current in extra magnet coils facing ends of tines. Current change of 1 ma in frequency-adjust coils gives frequency change of 50 parts per million. Input and output cathode followers isolate filter from rest of circuit. Drive and pickup amplifiers cancel fork insertion loss.-J. J. O'Connor, Tuning-Fork Audio Filter Tunes Electrically, Electronics, 33:49.