Police siren circuit using BC547, 555

Police siren circuit using BC547, 555

Police siren circuit using BC547, 555

Police siren circuit using BC547, 555

IC1 555
RV1 1MΩ
Q1  BC547
Q2  BC547
R2  1K Ω
R3  1K Ω
R5  330 Ω
R6  680 Ω
R7  680 Ω
RV2 50K Ω
RV3 50K Ω
C1  33 µF
C2  10 µF
C3  1 µF
C3  1 µF
C4  1 µF

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