What smoke detectors? What is its working principle?
When the smoke reaches a certain value, the voltage of the sensitive element will occur, and the current will be generated by the amplifying circuit. The external speaker will produce a certain frequency sound to show the alarm! For example, by igniting cigarette butts close to the alarm, a warning will be issued! Believe it, try it!
The so-called smoke detector to the principle is similar to the use of PM2.5 sensitive components as a probe.
