It also includes two systems: travel time and trouble.
1 travel time system: the travel time system of the pointer type quartz electronic alarm clock includes quartz resonator, CMOS integrated circuit (frequency division and drive), stepper motor (converting electrical energy into mechanical energy), counting and transmission mechanism, pointer mechanism, and other components; digital The timing system of quartz electronic alarm clock includes quartz resonator, CMOS integrated circuit (frequency division, calculation and drive), liquid crystal display or light-emitting diode, conductive rubber and other components; in addition, both pointer and digital include battery, trimmer capacitor, splint, And circuit board and other components.
2 trouble system: There are two. One is to output a signal by an integrated circuit or a transistor switching circuit (separating element) to drive a speaker or other sound device; the other is to directly use the electromagnetic principle, through the on and off current of the coil, and suck the hammer to strike the alarm. Or smother other sound devices.
There are many types of alarms when there are alarm clocks, such as a single bell, double bell, back bell, voice change, music, buzzer, bird, and time.