| Receiver unit | |
 Bar antenna
This is the bar antenna to receive the radio wave of 40KHz. |
Time-Code Receiver IC ( U4226B )
This is the exclusive use IC to take out the time information which is carried in the radio wave of 40KHz. At the data sheet, a radio clock system in some countries is introduced.
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Crystal oscillator for 40kHz
These crystal oscillators are used to receive the radio wave of 40KHz, being connected with receiver IC(U4226B). |
High precision film capacitor
In order to carry out operational stability of the receiver circuit, the capacitor of high capacity accuracy is required. |
Ceramic capacitor
This is also used for a receiver circuit. |
Photo-coupler ( TLP521-1 )
The receiver unit and CPU unit are installed and they are connected by a cable. Therefore, the photo coupler is used for the signal drive.
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NPN transistor ( 2SC1213 )
This transistor is used for the LED drive, etc.
Data sheet for 2SC1213 |
Choke coil
This is a coil for removing the noise generated when a receiver unit and a CPU unit are connected by a long cable. |
Electrolytic Capacitor
These capacitors are used in order to stabilize the supply voltage of a circuit.
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3 terminal regulator ( 78L05 )
This is a regulator for making the power supply (+5V) of a receiver circuit.
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Printed circuit board
The printed board of the receiver unit is using the one of the kit. IC for the receiver, chip resistors and chip capacitors are already mounted on the board.
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LED for TCO
This LED indicates the TCO(Time Code Output) signal. This LED is attached in a case. |
RJ-45 connector
RJ-45 connector is used for the cable connector of a receiver unit and a CPU unit. |
Stud
This metal stud is used to fix a printed circuit board on the case. |
Case
 As the case of receiver PR-140B made by TAKACHI is used. It's the case with a width of 140mm, a height of 45mm, and a depth of 90mm. |
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CPU unit | |
PIC16F873
PIC16F873 is used for the clock. This IC is processing the check of the received signal which the receiver detected, conversion of time information, and the display to LCD. Moreover, the function to read time with a personal computer using a RS232C interface is carried.
This RS232C interface function is used this time.
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High precision oscillator ( TCXO )
This is a high precision crystal oscillator for displaying exact time, even when a radio wave stops.
Oscillation frequency is 12.8MHz. |
NPN transistor ( 2SC1815 )
This transistor is used for the LED drive, the external circuit drive, etc.
Data sheet for 2SC1815 |
3 terminal regulator ( 7805 )
This is a regulator for making the power supply (+5V)
Data sheet for 7805 |
Diode bridge
This is a 1A type diode bridge. This diode is used in order to prevent the polar error at the time of power supply connection.
Since power supply connection is not changed with this equipment, this part is not used. |
IC socket
This is an IC socket for PIC16F873. Since 873 is the slim type of 28 pins, it can be used combining two sockets for 14 pins. |
LED
LED is attached to the kit. However, it has high brightness because of a clear type, and light is dazzling. Therefore, it was exchanged for LED of a soft light. |
Variable resistor
This is a variable resistor for adjusting the display contrast of LCD.
Since the parts attached to the kit broke, I used the part of a different type. |
Button switch
This switch is used for a setup of the clock function. |
Liquid-crystal-display panel ( SC1602BS-B )
This is a liquid-crystal-display panel (LCD) for displaying time. The display of two lines can be performed by 16 characters per line. |
LCD mounting supporter
Although one side of LCD is fixed by a connector, other one side is not fixed. This is a part used for the side which is not being fixed. |
Electrolytic Capacitor
This capacitor is used in order to stabilize the supply voltage of the circuit. |
Insulated washer
The circuit pattern is running near the attachment section of LCD. The insulated washer is used in order to prevent a short circuit with a nut. |
Printed circuit board
This is the printed circuit board of a CPU unit. The RS232C driver IC, the chip resistors etc. are already mounted. |
Stud
This is the parts for fixing the printed circuit board to a case.
The length is 10mm. |
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Display control unit | |
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Display drive unit | |
3-to-8 line Decoder ( 74HC138 )
This decoder is used in order to control the lighting position of each LED.
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Sink Driver ( TD62003 )
Seven NPN transistor circuits by which Darlington connection was made are built in this IC.
This is used for segment lighting control of LED.
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PNP transistor ( 2SA1015 )
This transistor is used for LED drive.
Data sheet for 2SA1015 |
NPN transistor ( 2SC1815 )
This transistor is used for LED drive.
Data sheet for 2SC1815 |
3 terminal regulator ( 7805 )
This is a regulator for making the power supply (+5V)
Data sheet for 7805 |
IC socket
In this circuit, the socket is used for all ICs. |
Resistor
This is the resistor of 1/6W. |
Heat sink
In order to radiate the heat of 3 terminal regulator, the 2mm aluminium board is used. |
Electrolytic Capacitor
This is the capacitor which reduces the ripple of a power supply.
It is 100uF/16V type. |
Multilayer ceramic capacitor
This is a capacitor for noise removal of a power supply. |
Printed circuit board
38 x 62 holes board is used.
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Stud
This is the parts for fixing the printed circuit board to the display panel.
The length is 5mm. |
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Display panel | |
LED for Hour and Minute
 50mm(H), 37mm(W), 13mm(D)
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LED for Second
 33mm(H), 22mm(W), 9mm(D)
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LED for Year, Month and Day
 18.8mm(H), 12mm(W), 8mm(D)
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LED for Week
 16mm(H), 16mm(W), 4mm(D)
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LED for Colon
This is LED used between Hour and Minute display. |
LED for Hyphen
This is LED used between Year and Month, and Month and Day display. |
Resistor
1/6W are used except R62. 1/2W are used for R62. |
Printed circuit board
38 x 62 holes board is used. |
Metal fittings for Display panel
The display panel consists of the printed circuit boards of two or more sheets. The angle is used for those connection and reinforcement. |
Display mask
Three kinds of material is used.
A transparent acrylics board with 0.5mm thickness at the bottom.
Black paper for mask at middle.
The purple acrylics board of 2mm thickness at the top. |
Stud
In order to fix a display panel to a case, the 15mm stud is used.
The 10mm stud is used for fixation of a display mask. Since the height of LED is 13mm, the washer is used for height adjustment. |
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Case | |
Case
The part case made from HOZAN (B-10-AA) is used for the case.
The inner size of the case is 245mm(W), 176mm(H), and 34.5mm(D). |
RJ-45 connector
This is a connector linked to a receiving unit. |
Power supply connector
This is the connector which connects a power supply adapter. |
AC adapter
This is the adapter which changes 100VAC into 12VDC. Current capacity is 200mA.
The consumed electric current of this clock is 100mA or less. |
LAN cable
The LAN cable is used as a cable which connects a receiving unit and a CPU unit. |
Chain
The chain was used in order to hang a clock in a wall. |
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