2 layers44.7 × 71 mm
2 layers77.2 × 54.6 mm
PCD with routing
mariam-essam2/Timer-555-PCB-projectA hardware-based 60-minute Pomodoro timer with dual 7-segment displays, manual/auto-reset, and buzzer alert. Fully simulated, tested, and ready for PCB fabrication with complete schematics, footprints, and Gerber files
- Size
- 77.2 × 54.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 42
- Pads
- 102
- Tracks, vias
- 395, 23
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 3 Sep 2026
- Updated
- 3 Sep 2026
Overview
PCD with routing is an open-source printed circuit board by mariam-essam2, from the mariam-essam2/Timer-555-PCB-project repository on GitHub. It is a 2-layer board of 77.2 × 54.6 mm with 23 parts on 42 nets, routed with 395 tracks and 23 vias.
It is built around the CD4026BE, NE555P and HDSP-523E. Its parts include 10 resistors, 5 diodes, 3 ICs, 2 transistors and 1 capacitor.
Main components
3
CD4026BE
DIP-16-55℃~+125℃ 1 100ns 3V~18V 6MHz Asynchronous Divide-by-10 Rising Edge Up Counter DIP-16 Counters, Dividers ROHSTexas InstrumentsCounters, Dividers
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
HDSP-523E
DIP-180.56 18.6mmx25mmx8mm 2 62.5mW 7 Segment Common Cathode Red DIP-18 LED Segment Displays ROHSBroadcom LimitedLED Segment Displays
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 1K | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5, R6 |
| 4 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4 |
| 2 | 220 | Resistor_SMD:R_0805_2012Metric | R9, R10 |
| 2 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2 |
| 2 | CD-4026 | Package_DIP:DIP-16_W7.62mm | U2, U3 |
| 1 | 1.8M | Resistor_SMD:R_0805_2012Metric | R8 |
| 1 | 10K | Resistor_SMD:R_0805_2012Metric | R7 |
| 1 | 22uF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | HDSP-523E | 7-Segment:LED_HDSP-523E | D5 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | SW_DPST | Button_Switch_THT:SW_CK_JS202011CQN_DPDT_Straight | SW1 |
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Questions
How big is the PCD with routing PCB?
It measures 77.2 × 54.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PCD with routing use?
23 parts, built around the CD4026BE, NE555P and HDSP-523E. 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.
Where can I download the PCD with routing KiCad files?
From the mariam-essam2/Timer-555-PCB-project repository on GitHub, at the commit this page was made from: the board is PCD with routing.kicad_pcb and its schematic 555 timer schematic.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PCD with routing design in my own project?
Its repository states no licence, so its author keeps all rights: ask mariam-essam2 before reusing the design.