CAR_ALARM_WITH_HORN_AS_LOUDSPEAKER

Published:2009/7/9 4:33:00 Author:May | From:SeekIC

An auto horn will work as a speaker of limited audio-frequency range. This circuit uses a 555 timer as an oscillator to drive an MJE34 transistor, which in turn drives the horn. Normal horn operation is ensured by blocking diode D4.



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