How digital alarm clocks work

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Digital alarm clock works:

A basic digital clock circuit is mainly composed of a frequency converter, “hour”, “minute”, “second” counter, time correction circuit, time signal circuit and oscillator. The main circuit system consists of a second signal generator. “The hour, minute, and second signal generators are the time base signals of the entire system. It directly determines the accuracy of the timing system. Generally, a quartz crystal oscillator plus a frequency divider is used to achieve. The standard The second signal is sent to the “second counter”. The “second counter” uses a 60-digit counter, and a “minute pulse” signal is sent every 60 seconds of conversion. This signal will be used as the clock pulse of the “minute counter.” The counter sends out a “time pulse” signal every 60 minutes. This signal will be called “time counter”. “Hour counter” adopts 24-hour timer, which can realize the accumulation of 24 hours a day. The decoding display circuit converts the output status of the “hour”, “minute”, and “second” counters with a seven-segment display converter and displays it through a seven-segment display. The time signal circuit generates a pulse signal according to the output state of the timing system and then triggers an audio generator to realize the time signal. When adjusting the time of the circuit, use the “hour”, “minute”, and “second” display numbers to adjust the adjustment.

Function description:

Digital alarm clock function: with optional 24h (hour) or 12h (hour) timekeeping mode, display hours, minutes, seconds; quick calibration hours, minutes, seconds function; can set alarm time, alarm time It is 1min (minutes), and it will stop automatically when it exceeds 1min (minutes). It has the function of stopping the alarm manually. After the alarm is stopped, it will not be re-operated and the alarm will no longer occur. Through the advancement and development of science and technology, some digital alarm clocks also have a projection function and are derived into auxiliary functions of many other products.

Advantages and disadvantages:


Compared with traditional mechanical clocks, digital alarm clocks have more outstanding advantages. Due to the development of digital integrated circuits using digital integrated circuits and the use of advanced quartz technology, digital alarm clocks have the advantages of accurate travel time, stable performance, and convenient portability. Digital alarm clocks are used for automatic alarm timing, automatic ringing on time, and automatic time program control. Various fields such as regular broadcasting and automatic control.


After all, digital alarm clocks are electronic products, and electronic products all have radiation. However, digital alarm clocks are extremely harmful and do no harm to the human body. They are not as radiant as mobile phones.

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