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Constant audio output two tone siren

2016-01-16 19:50  
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This circuit consists of two astable circuits.Sub circuit one (IC1) operates as a slow clock that modulates the output of the fast clock (IC2), which produces the audio output.This siren provides a constant audio output, but alternates between two separate tones. The LM13080 is set to oscillate at one basic frequency;This frequency is changed by adding a charging resistor in parallel with the feedback resistor, R2.Two-Tone Sirenis asiren designed to produce tonal sound with two simultaneous fundamental frequencies.