Electronic Alarm Clock Kits is a set of tool for producing an electronic alarm clock. With our guidance, you can make an electronic clock completely by yourself.It is very easy, simple and funny.

The following picture is a completed artwork made with our kits ：

（Picture 1）

Isn't it beautiful ? If you would like to own an electronic clock like this one, let's start to learn how to make it.

To make an electronic clock, we have to prepare something first. Then we will need:

You can choose 20W internal heated or 25W external heated soldering iron. The head of soldering iron shall be cutting head. If you are a starter, you can choose prong head as well. Normally, we set solder iron temperature value to 350 degrees.

（Picture2）

Once we gathered all these materials and tools, we can move on to our next step-- Assembly&Installation.

How to put these materials together to form a clock? This might seems headache . Well, we can start assemble from the inside to the outside of the clock. Let's begin!

Firstly, we have to use solder iron to solder 10K resistance onto PCB board. （Resistance has no positive or negative point.）

Note：R2 on PCB board was marked "4.7K" before，now updated to "10K".

Then solder 4.7K and 5.1k resistance according to the relative marks on PCB.

Find thermistor showed in the picture below:

Thermistor was marked NTC on PCB board. Solder thermistor onto the green circle area showed in the following picture.

Note:Thermistor has no positive or negative point.

Solder ceramic capacitor onto C1 and C2.

Note: 

1. Ceramic capacitor has no positive or negative point.
   
2. This component contains ceramic capacitor 12pf.
   

Monolithic capacitor solder on C3 and C4.(See Picture below.)

Note:

1. Monolithic capacitor has no positive or negative point.
   
2. This component contains monolithic capacitor 0.1uf.
   

Solder crystal oscillator to Y1 marked on PCB board.

Electronic clock adopt 8050 Triode marked Q1-Q5 on PCB board.

Note: Triode must solder in the same direction with PCB board.

Solder IC socket before plug IC.

Note：

One end of IC socket has a small concave. This end shall in the same direction with the concave mark on PCB board.You can see the above picture for reference.

There is a small concave on both IC and socket.Plug IC into socket according to the direction of concave.Don't plug IC wrong !

Note:

1. Battery base belongs to surface mount type. Before soldering, you have to add tin to a side of solder plate.
   
2. Battery base has positive and negative point.
   
3. The mark for battery base on PCB board has a horizontal line. When soldering, you have to make the iron plate of battery base mounted on the line marked on PCB.
   

You can solder microswitch according to the picture above.

Solder buzzer onto the green circle area pointed out in the picture below.

Note:

1. Buzzer has positive and negative point. 
   
2. Usually, you can see the positive point marked.
   
3. The pins of buzzer are comparatively longer.
   

DC socket is the main power supply port of electronic clock. You can solder DC socket according to the picture below.

Before soldering, we have to test LED display first. Supply power to LED display and check the number showed on the screen. If it works well, then you can start soldering.

Note: The third number shall be placed upside down. 

Once you have completed soldering. Don't forget to paste film paste!

Note:

Originally, there is a protection film on the surface of LED display and both side of film paste. Before pasting film, you have to tear down the original protection film on the surface of LED display and backside of film paste.The backside of film paste is adhesive, you can paste it on LED display directly. Then tear down the protection film on the surface and press it with a small cloth for cleaning the surface.

Unpack outer shell pack before installation. The place it according to the picture showed below.

UP

Bottom

Left
Right

Front

Back

After these parts assembled with PCB board, we have finished installation of electronic clock.

After installation completed, you have to reset circuit so that it can work properly. You can do it according to the following steps：

• Cut off power supply and press functional key and "+" key at the same time.Then supply power again and release the two keys. It will display "7:59".
  
• 5 seconds latter，it will display "8：00". This indicates successfully reset.And then buzzer alarms.Press "+" key, the alarm will stop.(Or you have to wait one minute before the alarm automatically stops.)
  
• Every 30 seconds it will display present temperature.
  
• Press "OK" key(functional key)，then hour digital tube display will start to flash. Press "+" key to adjust hour.
  
• Press "OK" key,then minute digital tube display will start to flash. Press "+" key to adjust minute. 
  
• Press "OK" key(functional key)，then hour digital tube display will start to flash. Press "+" key to adjust hour.
  
• Press "OK" key(functional key)，then hour digital tube display will start to flash. Press "+" key to adjust hour.
  
• Press "OK" key, then the digital tube display illuminate but not flash. Press "+" key, the signal light on the right bottom corner of fourth number illuminates, which indicates we turned on the alarm clock . When signal light is off, the alarm clock function is closed.
  
• 
  

1. Press "OK" key,hour digital tube starts to flash. Press "+" key to adjust the beginning time of round clock alarm. If you adjust it to the number "7", then it alarms at 7 o'clock in the morning.
   
2. Press "OK" key again, then minute digital tube starts to flash. Press "+" key to set a terminal time for round clock alarm. For example, if you adjust it to the number "23"，then from 8:00 am to 22:00pm you will hear round clock alarm.
   
3. Press "OK" key to exit. Then you have completed setting.
   

For more details, you can refer to our .

https://www.elecfreaks.com/9079.html

在淘宝中搜索“恩孚电子”，你可以以最优惠的价格购买到英国原装正版micro:bit哦！

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