MANUALLY_CONTROLLED_SIREN

Published:2009/7/22 1:12:00 Author:Jessie | From:SeekIC

When switch is pressed, output tone of loudspeaker builds from low to high frequency. Releasing switch brings high frequency slowly back to low point and then cutoff. Siren sounds can be varied manually by pushing and releasing switch at different points in cycle.C2 controls pitch, and R3 determines speed at which pitch changes.-F. M. Mims, Transistor Projects, Vol. 1, Radio Shack, Fort Worth, TX, 1977, 2nd Ed. p 58-63.



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