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CAR_ALARM_WITH_HORN_AS_LOUDSPEAKER

2017-01-15 06:32  
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CAR_ALARM_WITH_HORN_AS_LOUDSPEAKER
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.