 Microprocessor
(PIC16F873)
The receiving the data from console unit and
displaying control of them are done by PIC16F873.
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4-16 decoder
(74HC154)
This is the IC which decodes the binary code
of 4 bits.
16 conditions are indicated by 4
bits.74HC154 makes the output which corresponds to input's 4 bits an L
level.
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RS-232 Drivers/Receivers
(ADM232AAN)
This is ADM232AAN of the ANALOG
DEVICES Inc.. In this IC, 2 circuits of driver and 2 circuits of receiver
are housed.
This IC has the DC-DC converter to make
the voltage of +10V and -10V from +5V. So, the voltage of the RS-232C
(about ±9V) can be made only with +5V power.
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Voltage regulator (78L05)
This is the IC to make +5V with +12V
power. The output current of this regulator is 100mA.
Because to supply a power with this regulator is only IC's circuit,
it is enough if there is 100mA capacity.
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IC socket
PIC16F873 is the IC with 28 pins of
the slim type. When the slim type 28 pin socket can not be gotten, you can
use two sockets of 14 pins. I did like this to the circuit this
time. |
PNP type transistor (2SA1015)
This transistor is used for the
lighting-up control of the LEDs. PNP type is used when controlling LEDs on
the side of the power. The circuit this time is using +12V for the power
of the LEDs. So, PIC can not control an LED directly. It is controlled by
the combination in PNP-type and NPN-type.
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Resonator
 This is the oscillation device to make
the clock of PIC. A ceramic vibrator and capacitors are
incorporated.
The clock frequency this time is 4
MHz. It is possible to make do the operation of PIC16F873 with the a
maximum of 20MHz clock. |
NPN type transistor (2SC1815)
This transistor is used for the
lighting-up control of the LEDs. The voltage which can be controlled in
PIC is +5V. So, it works as the voltage change by LED control voltage
(+12V) and PIC(+5V), too.
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Multilayer ceramic
capacitor
These capacitors are used for the
DC-DC converter of RS-232 Drivers/Receivers and the high frequency bypass
capacitor of the power circuit.
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Switching diode ( 1S1588
)
A switching diode is used for the
lighting-up control of the LEDs for the category. The about 10mA electric
current flows through an LED. The forward direction maximum electric
current of this diode is 30 mA. |
Printed board
Universal printed boards with 55 x 40 halls
are used.
The lead wire interval of the LED is the
same as the hole of the printed board at 0.1 mm. However, the lead wire
has sometimes come to the end of the printed board when mounting LEDs. So,
the way of mounting LEDs needs consideration. |
Resistor
As for the resistor, all 1/6W are
used. |
Large-sized 7 segment
LED
For the displaying, a large-sized 7 segment
LEDs are used. The size of this LED is 12-cm height and 9-cm width. The
size of character is 10-cm height and about 8-cm width.
The small LED which is put in the right is the LED which is used
for the console unit. |
LED for the category
display
The LEDs which are arranged like a
matrix is used for the category display. It is 11 rows(horizontal side)
and 13 lines(vertical side). Total 143 LEDs are used. There are some LEDs
which aren't lit up, too. I considered the change of the future and
mounted all.
 |
DSUB connector
The serial cable of the DSUB9 pin is used for
the connection between the console unit and the display unit. Because the
power of the display unit is supplied from the console unit, a male
connector is used for the side of the display unit.
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Case
YM-400 which is made by the TAKACHI
Inc. is used.
The size has 400-mm width, 250-mm
height and 55-mm depth.
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Wiring connector
A display circuit is mounted into the cover of
the case and DSUB connector is mounted on the body of the case. Therefore,
it considers maintainability and a connector is used for the
wiring. |
Metal fittings for Display
pabel
A large-sized LED is mounted on more
than one printed board. The L angle which is made of aluminum is used to
connect those printed boards. |
Stud
This stud is used to put a
control unit and a diode matrix to the display panel.
10-mm length is used. |
Connecting cable
The screened cable which had 2 wires is used
for the cable of the console unit and the display unit. Plugs with the
DSUB connector are installed at the both
edges. |
