An electronic Albuterol inhaler had me puzzled.? Somehow it senses air motion, drawn by the user's lungs, to vaporize and deliver medication;? there is no power switch but an LED indicates air motion.
I ripped one open - unfortunately destructively - and found an apparent 6-lead 6mm mic element with an interesting rubber structure on it.? Inhaled air appears to pass through the structure which looks like a tiny whistle.? Hmmm.? An ultrasonic whistle?
Can a digital mic be dormant in silence, yet active when in sound?
Tom
