OldStyleDigitalClock
About the OldStyleDigitalClock PCB
OldStyleDigitalClock is an open source PCB design by decadenza, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 155 × 85 mm, with 85 components from 28 distinct parts.
Other key parts include the CD4071BM, D168K, CD4026BNSR, CD4073BM and NE555D. By type, the board carries 38 resistors, 19 capacitors, 15 ICs, 4 diodes, 3 connectors and 2 switches.
From the project
A digital clock with no microcontrollers.
The signal measured at one active LED segment is a square wave of a frequency > 30 Hz so that human eye cannot notice the flickering:
You may notice flickering if you use a camera to look at the clock. If this is a concern, you may reduce the C13 capacitor value to increase the frequency to the desired level. Full details in the schematics.
Main components on the OldStyleDigitalClock
OldStyleDigitalClock bill of materials (BOM)
85 components, 28 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CD4071BM | SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 4 | D168K | D1X8K | U2, U4, U7, U9 |
| 4 | CD4026BNSR | SOIC-16W_5.3x10.2mm_P1.27mm | U3, U5, U8, U10 |
| 1 | CD4073BM | SOIC-14_3.9x8.7mm_P1.27mm | U6 |
| 1 | NE555D | SOIC-8_3.9x4.9mm_P1.27mm | U11 |
| 1 | CD4060BM | SOIC-16_3.9x9.9mm_P1.27mm | U12 |
| 3 | CD4017BM | SOIC-16_3.9x9.9mm_P1.27mm | U13, U14, U15 |
| 1 | HC49 (32768 Hz C_{L}=12.5 pF) | Crystal_AT310_D3.0mm_L10.0mm_Horizontal | Y1 |
| 2 | USB_A_OUT | USB_A_Molex_67643_Horizontal | J1, J2 |
| 1 | USB_C_IN | USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J3 |
| 1 | 500 kΩ | Potentiometer_Alps_RK163_Single_Horizontal | RV1 |
| 1 | 10 MΩ | R_1206_3216Metric | R_{C}1 |
| 1 | 300 kΩ | R_1206_3216Metric | R_{S}1 |
| 1 | Set minutes | SW_PUSH_6mm | SW1 |
| 1 | Set hours | SW_PUSH_6mm | SW2 |
| 3 | 1N5819W | D_SOD-123 | D1, D3, D4 |
| 1 | Zener 5.6V (W7) | D_SOD-123 | D2 |
| 14 | 100 nF | C_1206_3216Metric | C1, C2, C3, C4, C5, C6, C7, C8 +6 |
| 1 | 10 µF | CP_Radial_D6.3mm_P2.50mm | C9 |
| 1 | 100 µF | CP_Radial_D6.3mm_P2.50mm | C10 |
Show 8 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1 nF | C_1206_3216Metric | C13 |
| 2 | 15 pF | C_1206_3216Metric | C15, C16 |
| 2 | 220 Ω | R_1206_3216Metric | R1, R17 |
| 28 | 4.7 kΩ | R_1206_3216Metric | R2, R3, R4, R5, R7, R8, R9, R10 +20 |
| 3 | 100 kΩ | R_1206_3216Metric | R6, R18, R38 |
| 2 | 10 kΩ | R_1206_3216Metric | R33, R34 |
| 2 | 5.1 kΩ | R_1206_3216Metric | R35, R36 |
| 1 | (5516) 10 kΩ @ 10 Lux / 500 kΩ @ dark | R_LDR_5.1x4.3mm_P3.4mm_Vertical | R37 |
OldStyleDigitalClock design files
The KiCad project lives in the decadenza/OldStyleDigitalClock repository on GitHub; these links point at the commit this page was built from.
- LayoutOldStyleDigitalClock.kicad_pcb
- SchematicOldStyleDigitalClock.kicad_sch
OldStyleDigitalClock: common questions
How big is the OldStyleDigitalClock PCB?
The OldStyleDigitalClock measures 155 × 85 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the OldStyleDigitalClock?
85 components, from 28 distinct parts. The full bill of materials is listed on this page.
Where can I download the OldStyleDigitalClock design files?
From the decadenza/OldStyleDigitalClock repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the OldStyleDigitalClock design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which decadenza chose for the repository.