High power siren

  
ICla and IClb are wired as a slow astable multivibrator and IClc-ICld are wired as a fast astable. The output of the slow astable modulates the frequency of the fast astable, and the output of the fast astable is fed to the external speaker via the Ql VMOS power FET amplifier stage.
High power siren  - schematic

Both are "gated" types, which can be turned on and off via PB1.




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