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American Police Car Siren by IC 555 | 1 view(s)

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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.

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The transistor is used to help strengthen the signal to the speaker

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