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BCD-counter using-D flipflop

nirav1385·BCD-counter-using-D_flipflop

BCD-counter using-D flipflop PCB layout, top view — open source board by nirav1385

About the BCD-counter using-D flipflop PCB

BCD-counter using-D flipflop is an open source PCB design by nirav1385, published on GitHub. It is a 2-layer board measuring 136.3 × 43.8 mm, with 18 components from 11 distinct parts.

Other key parts include the NE555P, 74LS74, 74LS47, HDSP-7401 and 74LS00. By type, the board carries 9 resistors, 6 ICs, 2 capacitors and 1 connector.

It belongs with the displays & leds designs in this gallery.

From the project

BCD Counter (0-9) using D-Flip Flops (74LS74) — Complete KiCad project with schematic, PCB layout, Gerber files & 3D renders. Built with NE555 + 74LS74 + 74LS00 + 74LS47 + 7-Segment Display.

A BCD counter counts from 0 to 9 (binary 0000 to 1001) and then resets back to 0. This design achieves that using:

1. NE555 Timer (Astable Mode) — Generates the clock signal for the counter. 2. 74LS74 D-Flip Flops — Four flip-flops (Q0–Q3) form the 4-bit binary counter. Each flip-flop's complementary output (Q̅) is fed back to its D input, creating a toggle behavior. 3. 74LS00 NAND Gates — Provide the combinational logic to detect count 10 (binary 1010) and force a reset, ensuring the counter wraps around after 9. 4. 74LS47 BCD-to-7-Segment Decoder — Converts the 4-bit BCD output into…

BCD-counter using-D flipflop, from the project README
From the project README

Main components on the BCD-counter using-D flipflop

NE555P74LS7474LS47HDSP-740174LS00

BCD-counter using-D flipflop bill of materials (BOM)

18 components, 11 distinct parts.

QtyPartRefs
1
NE555P
U1
2
74LS74
U2, U3
1
74LS47
U4
1
HDSP-7401
U5
1
74LS00
U6
1
Screw_Terminal_01x02
J1
1
47uF
C1
1
0.01uF
C2
1
1K
R1
1
15K
R2
7
330
R3, R4, R5, R6, R7, R8, R9

BCD-counter using-D flipflop design files

The KiCad project lives in the nirav1385/BCD-counter-using-D_flipflop repository on GitHub; these links point at the commit this page was built from.

BCD-counter using-D flipflop: common questions

How big is the BCD-counter using-D flipflop PCB?

The BCD-counter using-D flipflop measures 136.3 × 43.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BCD-counter using-D flipflop?

18 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the BCD-counter using-D flipflop design files?

From the nirav1385/BCD-counter-using-D_flipflop repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the BCD-counter using-D flipflop design in my own project?

The repository has no license, so all rights stay with nirav1385. Use it as a reference, and ask the author before reusing the design.

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