24h Digital Clock
About the 24h Digital Clock PCB
24h Digital Clock is an open source PCB design by erikvanzijst, published on GitHub. It is a 2-layer board measuring 152.9 × 74.9 mm, with 82 components from 35 distinct parts.
Other key parts include the SN74HC4060N, LD1117V, SN74HC14N, SN74HC157N and SN74HC74N. By type, the board carries 24 capacitors, 23 ICs, 22 resistors, 6 diodes, 3 switches and 1 transistor.
From the project
24H digital quartz clock from scratch
This project contains the schematics and PCB layout for a 24-hour digital quartz clock with self-dimming LED display.
Full write-up is at https://medium.com/@erikvanzijst/a-digital-quartz-clock-from-scratch-a80ec5e427
Main components on the 24h Digital Clock
24h Digital Clock bill of materials (BOM)
82 components, 35 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SN74HC4060N 74HC4060 | DIP-16_W7.62mm_Socket | U1 |
| 1 | LD1117V STMicroelectronics | TO-220-3 | U2 |
| 1 | SN74HC14N 74HC14 | Socket_DIP-14_0.775in_Conn | U3 |
| 1 | SN74HC157N 74HC157 | DIP-16_W7.62mm_Socket | U4 |
| 1 | SN74HC74N Texas Instruments | Socket_DIP-14_0.775in_Conn | U5 |
| 3 | CD74HC390E 74HC390 | DIP-16_W7.62mm_Socket | U6, U8, U10 |
| 2 | 74HC08 | Socket_DIP-14_0.775in_Conn | U7, U9 |
| 1 | NE555P Texas Instruments | DIP-8_W7.62mm_Socket | U11 |
| 6 | CD74HC4511E 74HC4511 | DIP-16_W7.62mm_Socket | U12, U13, U14, U15, U16, U17 |
| 6 | KCSC02-105 | 7SegmentLED_LTS6760_LTS6780 | U18, U19, U20, U21, U22, U23 |
| 1 | PN2222A | TO-92_Inline_Wide | Q1 |
| 1 | SS-52100-001 USB-SS-52100-001 Stewart Connector | USB_A_Stewart_SS-52100-001_Horizontal | J1 |
| 1 | 3362P-1-501LF 500R | Potentiometer_Bourns_3339P_Vertical_HandSoldering | RV1 |
| 1 | HOUR | SW_PUSH_6mm_H4.3mm | SW1 |
| 1 | MIN | SW_PUSH_6mm_H4.3mm | SW2 |
| 1 | TIME | SW_PUSH_6mm_H4.3mm | SW3 |
| 1 | ECS-.327-CDX-1038 ECS-_327-12_5-34B-TR ECS Inc. | Crystal_DS26_D2.0mm_L6.0mm_Horizontal | XTAL1 |
| 6 | D | Diode_DO-35_P10mm | D1, D2, D3, D4, D5, D6 |
| 2 | 22PF 22pF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2 |
| 18 | C320C104J5R5TA 100nF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C4, C5, C8, C9, C10, C13, C14 +10 |
Show 15 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10UF 100nF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C6 |
| 1 | 10UF 10uF | CP_Radial_Tantal_D5.0mm_P2.50mm | C7 |
| 1 | 47NF 47nF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C11 |
| 1 | 10NF 10nF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C12 |
| 4 | SFR2500001003FR500 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R5, R6 |
| 1 | SFR2500003303JA500 330k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | CF14JT10M0 10M | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | SFR2500002200FR500 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
| 1 | PDV-P7002 220R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | VT93xx | R_LDR_4.9x4.2mm_P2.54mm_Vertical | R9 |
| 1 | 10K 470K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10 |
| 1 | 5.1K 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11 |
| 1 | 5.1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12 |
| 8 | 4608X-102-151LF 150R | R_Array_SIP8 | RN1, RN2, RN3, RN4, RN5, RN6, RN7, RN8 |
| 2 | 4610X-102-151LF 150R | R_Array_SIP10 | RN9, RN10 |
24h Digital Clock design files
The KiCad project lives in the erikvanzijst/clock repository on GitHub; these links point at the commit this page was built from.
24h Digital Clock: common questions
How big is the 24h Digital Clock PCB?
The 24h Digital Clock measures 152.9 × 74.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 24h Digital Clock?
82 components, from 35 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the 24h Digital Clock design files?
From the erikvanzijst/clock repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the 24h Digital Clock design in my own project?
The repository has no license, so all rights stay with erikvanzijst. Use it as a reference, and ask the author before reusing the design.
