Genexiz/Seven_Segment_CounterThis project is part of From Schematic to PCB: Layout Fundamentals Course
Seven Segment Counter is an open-source printed circuit board by Genexiz, from the Genexiz/Seven_Segment_Counter repository on GitHub. It is a 2-layer board of 28.5 × 31.1 mm with 10 parts on 19 nets, routed with 104 tracks and 10 vias.
It is built around the CD4033BE and NE555D. Its parts include 4 resistors, 3 ICs, 1 capacitor, 1 diode and 1 switch.
This project is part of From Schematic to PCB: Layout Fundamentals Course
Correct footprint mapping and PCB design rule setup are foundational to Design for Manufacturability (DFM) and reliable circuit assembly. In electronic hardware development, a schematic only establishes logical connectivity; the physical footprint defines the exact mechanical geometry, pad dimensions, pitch, and pin assignments required for soldering. If footprint mapping is incorrect—such as misaligned pinouts on ICs or inverted diode/LED polarities—the board becomes non-functional, causing catastrophic failures like short circuits or permanent semiconductor damage. Similarly, establishing proper PCB design rules (trace width, clearance, annular ring size, and solder mask expansion) ensures that fabrication shops can manufacture the board within acceptable tolerances. Overlooking these constraints leads to severe fabrication defects, including etched trace open-circuits, solder bridging during reflow, and thermal dissipation failures. Ultimately, rigorous rule verification and footprint validation eliminate costly re-spins, optimize assembly yield, and guarantee long-term operational integrity.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 0.01uF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C1 |
| 1 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 220k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R2 |
| 1 | 470 | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R4 |
| 1 | 47K | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R1 |
| 1 | 47k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R3 |
| 1 | CD4033B | Package_DIP:DIP-16_W7.62mm | U1 |
| 1 | KCSC02-107 | Display_7Segment:KCSC02-107 | U3 |
| 1 | NE555D | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
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It measures 28.5 × 31.1 mm and has 2 copper layers, 1.6 mm thick.
10 parts, built around the CD4033BE and NE555D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the Genexiz/Seven_Segment_Counter repository on GitHub, at the commit this page was made from: the board is seven_segment_counter.kicad_pcb and its schematic seven_segment_counter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask Genexiz before reusing the design.
