Numitron-Clock
About the Numitron-Clock PCB
Numitron-Clock is an open source NXP PCB design by 74hc595, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 274.3 × 30.5 mm, with 39 components from 22 distinct parts.
Its main chip is the LPC811M001JDH16, from the NXP family. Other key parts include the STP16CP05, PCF2129AT, TPS70933 and LM1085ISX-ADJ/NOPB. By type, the board carries 8 ICs, 7 capacitors, 7 resistors, 6 connectors, 3 switches and 1 crystal.
It belongs with the displays & leds and power & battery designs in this gallery.
From the project
An alarm clock using 9-segment numitron displays
This is a digital alarm clock that uses Soviet surplus IV-19 (ИВ-19) incandescent "numitron" displays.
The feature set is similar to that of my Panaplex clock:
- Six digit display (hours/minutes/seconds and month/day/year) - Powered from a 5V USB charger - Coin cell battery backup keeps time when unplugged - Highly accurate oscillator; keeps time within ±3 parts per million - Piezo beeper alarm - Automatic leap year correction up to 2099 - Automatic daylight saving time correction (US) up to 2099 - 4-level brightness control - Sleep mode: can be configured to keep the display blanked and…
Main components on the Numitron-Clock
Numitron-Clock bill of materials (BOM)
39 components, 22 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | STP16CP05 | SOIC-24W_7.5x15.4mm_Pitch1.27mm | U1, U2, U3, U4 |
| 1 | LPC811M001JDH16 | TSSOP-16_4.4x5mm_Pitch0.65mm | U5 |
| 1 | PCF2129AT | SOIC-20W_7.5x12.8mm_Pitch1.27mm | U6 |
| 1 | TPS70933 | SOT-23-5_HandSoldering | U7 |
| 1 | LM1085ISX-ADJ/NOPB | TO-263-3Lead | U8 |
| 1 | PKLCS1212E2000-R1 | PKLCS1212 | Y1 |
| 1 | CONN_01X31 | Pin_Header_Straight_1x31 | J101 |
| 1 | CONN_01X30 | Pin_Header_Straight_1x30 | J102 |
| 1 | CONN_01X31 | Socket_Strip_Straight_1x31 | J201 |
| 1 | CONN_01X30 | Socket_Strip_Straight_1x30 | J202 |
| 1 | FTDI (ISP) | Pin_Header_Angled_1x06 | J204 |
| 1 | USB_OTG | UE25BE5510H | J205 |
| 1 | CR2032 | BAT-HLD-012-SMT | BT1 |
| 6 | IV-19 | IV-19 | N1, N2, N3, N4, N5, N6 |
| 3 | SW_Push | SW_PUSH_6mm | SW1, SW2, SW3 |
| 3 | 0.1uF | C_0603_HandSoldering | C1, C2, C3 |
| 1 | 1uF | C_0603_HandSoldering | C4 |
| 1 | 2.2uF | C_0603_HandSoldering | C5 |
| 1 | 10uF | C_1206_HandSoldering | C6 |
| 1 | 10uF | C_1210_HandSoldering | C7 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 6 | R | R_1206 | R1, R2, R3, R4, R6, R7 |
| 1 | 1k | R_1206 | R5 |
Numitron-Clock design files
The KiCad project lives in the 74hc595/Numitron-Clock repository on GitHub; these links point at the commit this page was built from.
Numitron-Clock: common questions
What microcontroller does the Numitron-Clock use?
The Numitron-Clock is built around the LPC811M001JDH16, from the NXP family.
How big is the Numitron-Clock PCB?
The Numitron-Clock measures 274.3 × 30.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Numitron-Clock?
39 components, from 22 distinct parts. The full bill of materials is listed on this page.
Where can I download the Numitron-Clock design files?
From the 74hc595/Numitron-Clock repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Numitron-Clock design in my own project?
Yes, under the terms of its BSD-3-Clause license, which 74hc595 chose for the repository.
Can I test firmware for the Numitron-Clock without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.
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