It also includes two major systems: walking time and alarm time.

①Travel time system: The travel time system of the analog quartz electronic alarm clock includes quartz resonator, CMOS integrated circuit (frequency division and drive), stepper motor (convert electrical energy into mechanical energy), counting and transmission mechanism, Pointer mechanisms and other components; the travel time system of digital quartz electronic alarm clocks includes quartz resonators, CMOS integrated circuits (frequency division, calculation and drive), LCD screens or light-emitting diodes, conductive rubber and other components; in addition, both pointer and digital Including components such as batteries, trimmer capacitors, plywood and circuit boards.

②Timeout system: There are two types. One is to use integrated circuits or transistor switching circuits (separate components) to output signals to drive speakers or other sound devices; the other is to directly use the electromagnetic principle to attract the hammer to strike the alarm through the on and off current of the coil. Or attract other sound devices.

There are many types of alarm clock sounds, including single-bell alarms, double-bell alarms, back-bell alarms, voice-changing alarms, music alarms, buzzer alarms, bird chirping alarms, timekeeping and so on.