10_V_SIREN_CHIP

Published:2009/7/22 1:14:00 Author:Jessie | From:SeekIC

One section of National MM74C908/MM74C918 dual CMOS driver is used as audio VCO and other section as voltage ramp generator that varies frequency of VCO. Combination gives siren effect at low cost, with output current up to 250mA for driving loudspeaker.- CMOS Databook, National Semiconductor, Santa Clara, CA, 1977, p 5-38-5-49.



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