2 layers337.6 × 133 mm
2 layers121.4 × 130.3 mm
Digital clocks
alfpedraza/electronicsKiCad Electronics Projects
- Size
- 121.4 × 130.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 122
- Nets
- 220
- Pads
- 583
- Tracks, vias
- 2,139, 65
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 13 Jul 2022
- Updated
- 2 Sep 2025
Overview
Digital clocks is an open-source printed circuit board by alfpedraza, from the alfpedraza/electronics repository on GitHub. It is a 2-layer board of 121.4 × 130.3 mm with 122 parts on 220 nets, routed with 2,139 tracks and 65 vias.
It is built around the 74LS32SC, CD4060BE and 74HC14, with the 74LS04PC among its other parts. Its parts include 53 resistors, 27 ICs, 20 diodes, 7 capacitors and 4 switches. It belongs with the lEDs and displays boards of this library.
Main components
4
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
CD4060BE
DIP-16-40℃~+85℃ 100ns 12MHz 14 2V~20V Asynchronous Asynchronous Binary Counter Falling Edge Reset function DIP-16 Counters, Dividers ROHSHGSEMICounters, Dividers
74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
README
README.mdelectronics
KiCad Electronics Projects
Parts
122| Qty | Value | Footprint | References |
|---|---|---|---|
| 42 | 560 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R10, R11, R12, R13, R14, R15, R17, R18, R19, R20, R21, R22, R23, R24, R25 +26 |
| 20 | 1N4148 | Diode_THT:D_T-1_P5.08mm_Horizontal | D1, D2, D3, D4, D5, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20 +4 |
| 8 | NetTie_2 | NetTie:NetTie-2_SMD_Pad0.5mm | NT1, NT2, NT3, NT4, NT5, NT6, NT7, NT8 |
| 6 | 40193 | SN74LS:DIP792W45P254L1969H508Q16 | U9, U10, U15, U16, U17, U22 |
| 6 | 74LS47 | SN74LS:DIP792W45P254L1969H508Q16 | U4, U6, U11, U13, U18, U20 |
| 6 | NFD-5011B | Display_7Segment:7SegmentLED_LTS6760_LTS6780 | U5, U7, U12, U14, U19, U21 |
| 4 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R31, R47, R50 |
| 4 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1, C3, C4, C5 |
| 3 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R16, R46, R48 |
| 3 | 74LS08 | SN74LS:DIP794W45P254L1969H508Q14 | U1, U2, U26 |
| 3 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW1, SW2, SW3 |
| 2 | 120k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R51, R52 |
| 2 | 74LS32 | SN74LS:DIP794W45P254L1969H508Q14 | U3, U23 |
| 2 | CD4060BE | SN74LS:DIP794W45P254L1969H508Q16 | U24, U27 |
| 1 | 0.1uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C7 |
| 1 | 10Meg | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R49 |
| 1 | 22pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C6 |
| 1 | 22pF | Capacitor_THT:CP_Radial_Tantal_D6.0mm_P5.00mm | C2 |
| 1 | 32.768 kHz | Crystal:Crystal_C38-LF_D3.0mm_L8.0mm_Horizontal | Y1 |
| 1 | 330k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R57 |
| 1 | 74HC14 | SN74LS:DIP794W45P254L1969H508Q14 | U25 |
| 1 | 74LS04 | SN74LS:DIP794W45P254L1969H508Q14 | U8 |
| 1 | SW_SPDT | Switches:SW_500SSP1S2M2QEA | SW5 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J1 |
| 1 | USB_A | Connector_USB:USB_A_Molex_67643_Horizontal | J2 |
Questions
How big is the Digital clocks PCB?
It measures 121.4 × 130.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Digital clocks use?
122 parts, built around the 74LS32SC, CD4060BE, 74HC14 and 74LS04PC. 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 Digital clocks KiCad files?
From the alfpedraza/electronics repository on GitHub, at the commit this page was made from: the board is digital-clocks/digital-clocks.kicad_pcb and its schematic digital-clocks/clock-clock-signal.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Digital clocks design in my own project?
Its repository states no licence, so its author keeps all rights: ask alfpedraza before reusing the design.
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