Hello,
Is it possible to hear an electric motor in ultrasonic frequencies? I remember seeing somewhere that motors and gears are VERY noisy at the ultrasonic level, but I am not sure. If so, can you make two separate bat detector circuits, put the two microphones facing opposite directions and be able to "hear" a motor spinning for a significant distance...and tell the direction?
Does this sound feasible, or would I just be waisting my time?
Thanks,
George L.