①Travel time system: The travel time system of the pointer quartz electronic alarm clock includes quartz resonators, CMOS integrated circuits (frequency division and drive), stepper motors (convert electrical energy to mechanical energy), counting and transmission mechanisms, pointer mechanisms and other components; digital The travel time system of the quartz electronic alarm clock includes quartz resonators, CMOS integrated circuits (frequency division, calculation and driving), liquid crystal display or light-emitting diodes, conductive rubber and other components; in addition, the pointer type and digital type include batteries, trimmer capacitors, plywood And circuit boards.
② Alarm system: There are two types. One is to output signals by integrated circuits or transistor switching circuits (separate components) to drive speakers or other sound devices; the other is to directly use the electromagnetic principle, through the on and off currents of the coil, to attract the hammer to strike the alarm, Or attract other sound devices.
There are many types of sounds for alarm clock, such as single bell alarm, double bell alarm, back bell alarm, voice change alarm, music alarm, beep alarm, bird alarm, time alarm and so on.