The second circuit simulates the siren of an American police car. It uses two
555 timers in the circuit. The 555 on the right is wired as an alarm tone
generator and the second 555 timer on the left is wired as a low frequency
astable timer which generates a ramp waveform of about 6 seconds that is
buffered by the transistor and again used to frequency modulate the tone
generator. The transistor is used to help strengthen the signal to the
speaker
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