Fire_siren_using_an_LM3909_chip

Published:2009/7/17 4:47:00 Author:Jessie | From:SeekIC

Fire siren using an LM3909 chip. Circuitry inside dashed lines is the LM3909.This circuit produces a rapidly rising sound when pressing the pushbutton and a coasting sound upon release (courtesy National Semiconductor Corporation).



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