A. 6-digits 7-segment LEDs Display Driver
B. Schematic Diagram
Here is the complete schematic diagram (I drawn it with Protel V1.0).
click the image for zooming
C. PCB Layout
For the PCB layout, I drawn it using a single layer side. Here is the complete PCB layout (I drawn it with Protel V1.5).
click the image for zooming
D. Mounting
All the circuit are very best if it can fit in a box. I put it all in a box size of 20 cm (long) X 10 cm (wide) x 3 cm (tall). The layout panel consist of 6-digits 7-segment LEDs, miniature jack socket, miniature on/off switch, power indicator lamp, DB-9 female connector for dot bits LEDs, and DB-25 female connector for 6-digits BCD input LEDs. Its quiet a compact device
E. Components
- Resistors:
1. R1...R48=220 Ohm.............48 pcs
- Diodes:
- ICs:
1. SS1...SS6=7-Segment LED, common anode, green color..6 pcs
1. Decoder/Driver IC1...IC6=74LS247...........6 pcs 2. Buffer IC7=7407........................... 1 pcs
- Others:
1. Con1=DB-25 female socket........................ 1 pcs 2. Con2=DB-9 female socket......................... 1 pcs 3. Con3=Miniature jack socket (mono) - Optional.... 1 pcs 4. S1=Miniature on/off switch (spdt) - Optional.... 1 pcs 5. Indicator lamp 5V - Optional.....................1 pcs
F. Testing
The software test needs LPT expander card for interfacing the circuit. It can both except LPT expander card when run on LPT port or using decoder for PPI-8255. There are 3 kind of test; first is displaying any numerical inputed by user, second is counting up from 0 to 999999, third is displaying the clock. Please try by your self.
G. Prototype
My prototype shown below. The panel made by plastic sheet same as the 36-LEDs display driver. Here is the picture.
H. Application
Here is the application program and hardware. The program test on 80486-DX2-66 PC/AT computer
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