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Warning or Alert signals Tone Alarm Circuit

2016-02-19 04:13  
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Using very popular multivibrator 555 IC, we can build analarm circuitwhich is similar to oldambulancesiren. There are two sections inside the circuit, first is a low frequency oscillator for two level frequency modulation, and the second is the higher frequency oscillator for sound generation.IC1 generates a pulse that modulates the 1000-Hz tone generated by  IC2 .This circuit can be used to generate warning or alert signals.The "general alert" signal is sounded when there is a possible threat to the population. It signals to the population that they should turn on the radio and follow instructions from the authorities. The general alert signal is a regular ascending and descending tone.

1000Hz Pulsed Tone Alarm Circuit 



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