مخطط ساعه رقميه

[أحمد شريف غانم]

السلام عليكم

هذا مخطط لدائره ساعه رقميه





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Pattern drawing of Digital Clock
(Wiring side)




Olive-green line shows the wiring at the component side.
Pink lined parts shows the external parts.

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Digit display circuit



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Clock control PIC ( PIC16F873 )





Peripheral circuit CPLD ( XC9536-PC44 )




Melody IC ( SVM7975C )





Low-frequency amplifier ( LM386N-1 )





Power for disply ( 78L05 )





Power for low-frequency amplifier ( 78L09 )





Power for TV tuner ( 78L12 )





Power for basic part ( S813-50HG )





LED control transistor ( 2SA1015 )

[أحمد شريف غانم]

تابع للقطع اللازمه

Diode for backup






IC socket




PLCC




Resonator




7 segment LED for the time display



LED for the AM/PM display




LED for the time mark




LED for the melody IC.




Baton switch for the melody choice.




Resistor network




Variable resistor for TV tuning

.



Resistor




Multilayer ceramic capacitor






Electrolytic capacitor

.



Acrylic board for the LED display filter

.



Printed board




Wiring terminal




Connector




Stud

[أحمد شريف غانم]

نبقى الآن مع شرح القطع واستخداماتها





Diode for backup


This is a diode for the current control for backup battery. 1A type is used.



IC socket


These are IC sockets for mounting PIC, melody IC and low-frequency amplifier.
28 pin socket for PIC is a slim type. If the pin interval suits, it is to be OK even if it uses the one of 14 pins in series.



PLCC


This is the IC socket to mount CPLD. It is a 44 pin type.
As for the pin arrangement, refer to "PLCC socket".



Resonator


4MHz resonator is used for the clock vibrator of PIC.
When changing a frequency, the timing with LED display period and so on change. It isn’t related with the precision of the clock.



7 segment LED for the time display


A biggish 7 segment LED is used for time and a minute display. A small type is used for the second display.



LED for the AM/PM display


These are the LEDs to use to display the character of AM and PM. Four LEDs are housed inside. The black papers which cut out AM and PM character are pasted on the surface of the LEDs.



LED for the time mark


These are the LEDs which are used for the border of the time display and the minute display.



LED for the melody IC

These are the LEDs for power voltage control and input voltage control of melody IC. The maximum voltage of SVN7975C is about 3V. About 2V is made with resistor and LED from the 5V. This LED always lights up. The whiter LED is it and lights up to the green.
Because the control signal from PIC is 5 V too, so, a resistor and an LED are similarly used. The red LED is it.




Baton switch for the melody choice

When the power of the clock stops fully, it upsets in the order of the melody. The music can be switched every time it pushes this switch.




Resistor network

This resistor is used for input pull up of SR-FF.
Resistance network is used in the relation of the mounting space.




Variable resistor for TV tuning


This resistor is used to choose a TV station.



Resistor


1/8-W resistor is used.



Multilayer ceramic capacitor


These capacitors are used to bypass the high frequency noise of the input and output of the power supply.




Electrolytic capacitor


These capacitors are used as the coupling capacitor of the melody IC circuit. Because there is polarity, when mounting, an attention is needed.



Acrylic board for the LED display filter


A purple colored acrylic board is put to the front of the LED. The LEDs which light up can be seen cleary with this acrylic board .



Printed board


An universal printed board with 40 x 50 halls is used.
The board to have cut in the needed size is used.



Wiring terminal


This terminal is used to wire in the part outside.



Connector


This is the connector which is used for the connection of the speaker.
A speaker is put to the front of the case. When repairing and so on, it sometimes removes a wire. Therefore, a connector is used for the connection.

[أحمد شريف غانم]

تابع شرح القطع

Stud


These studs are used for the installation of the printed board, the installation of the acrylic board for the LED filter.
For the printed board installation, 5mm is used and for the acrylic board installation, 10mm is used.




Clock control PIC ( PIC16F873 )


This is the one-chip central processing unit to take charge of the brain of the clock.
The feature of the clock is realized by the software which was programed in this PIC.
An advanced feature isn’t used. As the feature, PIC16F84 is possible. However, I am using PIC16F873 in the relation of the number of the input-output ports.










Peripheral circuit CPLD ( XC9536-PC44 )


This is the logic device which it is possible to program. This can attempt to compact-ize a circuit.
This time, SR-FF, 3-8 decoder and 1/200000 frequency divider are incorporated into this device. For the details, refer to "Peripheral circuit for Digital Clock".
When not using CPLD, the similar circuit can be composed using one 74HC00 for SR-FF, one 74HC138 for 3-8 decode and three 74HC390 for 1/200000 divider.








Melody IC ( SVM7975C )

This is melody IC. 8 pieces of music are memorized in this IC.
IC is designed to be able to connect the transistor to drive a speaker.
The circuit this time is using amplifier (LM386) outside because for expanding a volume range.
9 Vss GND 18 Vdd Power


Low-frequency amplifier ( LM386N-1 )


This is the small amplifier which is possible to let out an about 500-mW output power. It is convenient because it doesn’t need a related part.
This is used for the amplification of the time signal(Electronic music) and the amplification of the television sound in adjustment.





Power for disply ( 78L05 )

This is the 3 terminal regulator to get stable +5V.
This is used for the power of the LED for the display.
It is a 100-mA type.




Power for low-frequency amplifier ( 78L09 )

This is the 3 terminal regulator to get stable +9V.
The maximum voltage of LM386N-1 is 12V. So, a regulator is used because it makes not exceed this.
It is a 100-mA type.




Power for TV tuner ( 78L12 )

The stable 12V voltage as the power of the TV tuner with this regulator is made. The TV tuner which was used this time needs the power which was stable because it chose a broadcasting station by the voltage.
It is a 100-mA type.



Power for basic part ( S813-50HG )

This is the 3 terminal regulator to get stable +5V.
This power is used for PIC, CPLD and melody IC. These devices can operate even if commercial power stops because they are backed up by the battery. Because I made the voltage of the battery 7.2 V, few voltage drop type is used for a regulator.



LED control transistor ( 2SA1015 )

This transistor is used to control the 7 segment LED in the lighting-up. It uses the PNP type because it controls the anode side of the LED.

[المياسه]

شكـــــــــــــــــــــــــــــــــ ـــــــــــــــرا جزيلا


واتمنى لك التوفيق

راح احاول تطبيقه واذا واجهتني اي مشكله (لا قدر الله) اعرف الي اين اتجه لسؤال؟؟؟؟؟؟؟


مع خالص الشكر والتقدير

والله وحده الموفق

[أحمد شريف غانم]

ضعي سؤالك اختي الكريمه هنا



تحياتي

[المياسه]

بسم الله الرحمن الرحيم


أعتذر عن الازعاج ولكن من خلال الموضوع هنا وقبل انا ابداء بالتوصيل لدي بعض الاسئلة



http://www.interq.or.jp/japan/se-inoue/gif/pic6_732.gif

1-هذا هو المخطط للساعه هنالك 1 (مالتبليكسر-Multiplexers-) والاخر هل هو (ديكودر-Decoders-) ؟؟؟


2-وهل هذا المخطط يحتاج إلى فقط 1 من المالتبليكسر (Multiplexers)و1 ديكودر(Decoders)؟؟؟؟

3- ماهي المدخلات خلال الديكودر؟؟؟اتضح من المخطط المخرجات له ولكن ماهي المدخلات؟؟؟


مع خالص الشكر والتقدير

واعتذر عن الازعاج مره ثانيه