American Police Car Siren by IC 555

Posted on Feb 5, 2014

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 freq

 American Police Car Siren by IC 555
Click here to download the full size of the above Circuit.

uency modulate the tone generator. The transistor is used to help strengthen the signal to the speaker

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