Siren operates off 3V
The way I look at it is that you need to start off with a basic sound wave signal (what waveform would you suggest). Then, the schmitt trigger comes into the picture by acting as an oscillator. That is it "comes on" at a certain frequency and "turns off" at a certain tone frequency.
Then, the "two tone" bit would have to work in the on -part of the schmitt trigger frequency. Would it be ok to say that the base frequency the schmitt trigger oscillates around depends upon on its R and C values. At this stage, I am looking to work with a 1 - 5 kHz frequency.
As another option, what would happen if I play around with the amplitude of the input signal? would I still get a two tone signal????
Am I on the right track here with this chain of thinking????
Thanks.