Digital Alarm Clocks
January 25th, 2010 | by admin |
There are times when people look at their existing clock and think about replacing it for another type. You will find in this case that you have a wide choice to look at. Some of these will include the ones which are digital in format. These digital alarm clocks can be found in different styles and makes. You will need to choose the one which is most suited for you.
When you are choosing one of these digital alarm clocks the main thing that you will need to remember is that you need a clock which is reliable. You can find these digital alarm clocks set at varying prices.
As this is the case you will have a wide choice of clocks to look over. You should understand that since you are looking to buy one of these clocks it is in your best interests that you buy one which is known to be free from electrical problems.
You can find these different digital alarm clocks in the stores which sell these types of products. You can also order the alarm clock that you want from various online stores. This route is one that you will need to take some care with as sometimes you will end up buying a digital clock which is not right for the tasks that you have.
Among the many different types of digital alarm clocks you will see ones for adults as well as ones for children. In these digital alarm clocks you will see that the price is based on the clock type itself. Additionally you will see that there are alarm clocks which can combine the facilities of music to them.
These digital alarm clocks are better known to us as radio alarm clocks, CD alarm clocks and then you also have mp3 alarm clock radios. With all of these alarm clocks you will find that you can set the alarm so that you awaken to music. While this is one of the more pleasant ways to wake up there are other types of digital alarm clocks that you can buy.
These digital alarm clocks look like ordinary alarm clocks. These however are known to be talking clocks. The alarm that you can choose from these clocks will range from the mild ringing of a bell to that of the strident rooster crow. When you buy one of these digital alarm clocks you will see that you have a better chance of starting your day as you desire. Fresh and ready to take on the world.
Uladzislau Suski
http://www.articlesbase.com/shopping-articles/digital-alarm-clocks-287754.html
2 Responses to “Digital Alarm Clocks”
By solo sam on Jan 25, 2010 | Reply
Does anyone know anything about the circuitry of digital alarm clocks?
By soloban on Jan 25, 2010 | Reply
Your question is a little bit vague…
On a larger level there should be a timing sub circuit which controls the clock it self. Time is usually kept by an incrementing pulse counter. Either the 60 Hz AC or a quartz device creates a pulse on a consistant basis. There are counters for the HH:MM:SS. For example the seconds increment and once they reach 60 it triggers the pulse counter chip for the minutes and resets the seconds counter.
As far as the alarm part there would be a comparator function. The clock stores the alarm time and when the incrementor gets matches the alarm time then it probably triggers a relay that enables the sound. The snooze button probably increments the comparision time and repeats the process.
As far as displaying the time, the binary representation of the time is fed to another sub circuit which tells which part of the LCD clock face to light up.
All that being said, they can program all that functionality onto an all encompassing chip. A digital alarm clock would be fairly easy to program on a microcontroller like a Motorola HC6811. Something like that could be done by a Sophomore or Junior Electrical Engineering student.
If you want to know more about stuff like that look for books on digital design, state machines, programmable logic controllers, etc.
Are you trying to repair one?
References :
B.S. Electrical Engineering