Simple high-power sweeping siren circuit diagram

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As shown in the figure, the circuit consists of two 555s. The oscillation frequency of the first multivibrator is about 5 Hz. The square wave of the 3-pin output is applied to the 2 pin of the IC via the potentiometers RP and DW, and formed on the capacitor C1. The triangular wave causes IC2 to generate a frequency sweep from high to low and low to high, similar to the effect of a siren. The control voltage terminal 5 of IC2 is short-circuited with the 6-pin terminal of the threshold value, which enhances the sound effect of the siren, and promotes the level of the actual application, and decides whether to use the high-power triode and the tweeter.