SIREN_WARBLE_GENERAIOR

Published:2009/7/9 23:18:00 Author:May | From:SeekIC

Genemtes singletone and wcrble signals. Blocking oscillators Q3 and Q4, having slightly different frequendes, are frequency-modulated by triangular-wave output of low-frequency mvbr Q1-Q2, to produce siren-type wail.-W. F. Ferguson, High-Powered Audio Alarm Systems, Eleeronics, 33:16, p 70-72.



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