MUSICAL_BELLS

Published:2009/7/1 20:57:00 Author:May | From:SeekIC

Opamp connected as active filter simulates attack followed by gradual decay as produced when bell or tuning fork is struck. Filter portion of circuit uses twin-T network adjusted so active filter breaks into oscillation when slight external disturbance is intro-duced by closing S1 momentarily. Circuit feeds external audio amplifier and loudspeaker for converting ringing frequency into audible sound. Set R3 just below oscillation point. R1and R2 can be adjusted to give sounds of other musical instruments, such as drums, bamboo, and triangles.-F. M. Mims, Electronic Music Projects, Vol. 1, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 71-80.



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