Dual Tone Single IC Siren

This circuit is a double tone Police sound and Single tone old ambulance sound. This circuit is usually installed on a on battery powered cars, motorcycles, and bicycles for fun kid not only that, this circuit also used in  models and other games. The oscillation of IC1A and IC1B gates produces the typical dual tone sound of Fire-brigade  or Police […]

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Wailing Alarm Siren

This alarm siren circuit give continuous frequency sweep, a warbling sound. The warbling period is about 6 seconds, 3 seconds for frequency sweeping up and 3 seconds for frequency sweeping down. You can change the warbling frequency of this alarm siren by changing the C1 capacitor value. You can vary the value between 10 uF to 47 uF  and get […]

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