Nixie Clock
About the Nixie Clock PCB
Nixie Clock is an open source PIC PCB design by drewsum, published on GitHub. It is a 2-layer board measuring 200 × 50 mm, with 266 components from 89 distinct parts.
Its main chip is the PIC16LF1519-I/MV, from the PIC family. Other key parts include the LTC4365IDDB, LT3973-DD, LT3757, LT6700-1-S6 and 74HC4514. By type, the board carries 130 resistors, 58 capacitors, 32 transistors, 16 ICs, 14 diodes and 9 connectors.
It belongs with the displays & leds designs in this gallery.
From the project
A nixie clock designed around a PIC16LF1519
Rev B Hardware designed with KiCad 7.0.1
Rev B MCU Firmware written with MPLAB X IDE v6.15, compiled with Microchip XC32 2.30 Compiler - NOT COMPATIBLE with newer compiler versions (4.30)
Programming notes: PIC16LF1519 (U501) is programmed through PICKIT3 interface header (J501). Firmware included in GIT repository should already be built and the hex file can be programmed directly into the flash on the PIC. If you wish to build it yourself, use Microchip's XC8 compiler, and ensure that the User ID bytes located in NVM match the expecteduserID[] byte array saved in RAM. The values…
Main components on the Nixie Clock
Nixie Clock bill of materials (BOM)
266 components, 89 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LTC4365IDDB | DFN-8-1EP_2x3mm_Pitch0.5mm | U201 |
| 1 | LT3973-DD | DFN-10-1EP_3x3mm_Pitch0.5mm | U301 |
| 1 | LT3757 | DFN-10-1EP_3x3mm_Pitch0.5mm | U401 |
| 1 | LT6700-1-S6 | SOT-23-6 | U402 |
| 1 | PIC16LF1519-I/MV | QFN-40-1EP_5x5mm_Pitch0.4mm | U501 |
| 1 | 74HC4514 | SOIC-24W_7.5x15.4mm_Pitch1.27mm | U601 |
| 1 | LTC3226 | QFN-16-1EP_3x3mm_Pitch0.5mm | U701 |
| 1 | 74HC238 | SOIC-16_3.9x9.9mm_Pitch1.27mm | U801 |
| 1 | 74AUC1G17 | SOT-23-5 | U901 |
| 1 | 74LVC2G17 | SOT-23-6 | U1101 |
| 4 | MAX6816 | SOT-143 | U1201, U1301, U1302, U1303 |
| 1 | 74LVC1G11 | SOT-363_SC-70-6 | U1202 |
| 1 | ECS-327KE | ECS-327KE | U1401 |
| 1 | Si4946 | SOIC-8_3.9x4.9mm_Pitch1.27mm | Q201 |
| 1 | IRFL214 | SOT-223_3 | Q401 |
| 1 | DMP3099L | SOT-23 | Q701 |
| 19 | MMSTA42 | SOT-323_SC-70 | Q901, Q902, Q903, Q904, Q905, Q906, Q907, Q908 +11 |
| 6 | MMSTA92 | SOT-323_SC-70 | Q1001, Q1002, Q1005, Q1006, Q1009, Q1010 |
| 4 | DMG1012UW | SOT-323_SC-70 | Q1201, Q1202, Q1203, Q1204 |
| 1 | 20MHz | CX5032GB20000H0PESZZ | Y501 |
Show 69 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Power Input | BARREL_JACK | J201 |
| 1 | PicKit3_Header | Pin_Header_Angled_1x06_Pitch2.54mm | J501 |
| 1 | Display | Pin_Header_Straight_1x02_Pitch2.54mm | J1201 |
| 1 | Seconds | Pin_Header_Straight_1x02_Pitch2.54mm | J1301 |
| 1 | Minutes | Pin_Header_Straight_1x02_Pitch2.54mm | J1302 |
| 1 | Hours | Pin_Header_Straight_1x02_Pitch2.54mm | J1303 |
| 1 | Cathodes | Socket_Strip_Straight_1x11_Pitch2.54mm | J1501 |
| 1 | Anodes | Socket_Strip_Straight_1x06_Pitch2.54mm | J1502 |
| 1 | Aux | Socket_Strip_Straight_1x06_Pitch2.54mm | J1503 |
| 1 | 3A | R_1206 | F201 |
| 1 | 12Hr | Pin_Header_Straight_1x02_Pitch2.54mm | JP1201 |
| 1 | ForceConnSense | Pin_Header_Straight_1x02_Pitch2.54mm | JP1501 |
| 7 | SMD1200PL | D_SOD-123F | D201, D202, D401, D402, D403, D1204, D1205 |
| 3 | 3.3V | D_SOD-323 | D203, D1206, D1501 |
| 1 | PGOOD | LED_0603 | D1201 |
| 1 | Error | LED_0603 | D1202 |
| 1 | Tick | LED_0603 | D1203 |
| 1 | Enable | LED_0603 | D1207 |
| 1 | 10uH | IHLP-2525CZ-01 | L301 |
| 1 | 680uH | Wurth_7447709681 | L401 |
| 1 | BKP1005HS121-T | R_0402 | L1401 |
| 14 | 0.1uF | C_0402 | C201, C406, C409, C501, C601, C801, C901, C1101 +6 |
| 13 | 10nF | C_0402 | C202, C410, C502, C602, C802, C902, C1102, C1202 +5 |
| 13 | 1nF | C_0402 | C203, C411, C503, C603, C803, C903, C1103, C1203 +5 |
| 1 | 0.47uF | C_0402 | C301 |
| 1 | 4.7uF | C_1206 | C302 |
| 1 | 22uF | C_0805 | C303 |
| 1 | 15pF | C_0402 | C304 |
| 3 | 0.1uF | C_0805 | C401, C402, C404 |
| 1 | 2.2uF | C_2220 | C403 |
| 1 | 10uF | C_1206 | C405 |
| 1 | 4.7uF | C_0805 | C407 |
| 1 | 6.8nF | C_0402 | C408 |
| 2 | 12pF | C_0402 | C504, C505 |
| 1 | 100uF | CP_Tantalum_Case-B_EIA-3528-21_Reflow | C701 |
| 1 | 2.2uF | C_0402 | C702 |
| 1 | 2.2uF | C_1206 | C703 |
| 2 | 15F | MAL219691214E3 | C704, C705 |
| 13 | 100k | R_0402 | R201, R1001, R1002, R1009, R1010, R1017, R1018, R1102 +5 |
| 8 | 1M | R_0402 | R202, R207, R301, R304, R409, R502, R706, R707 |
| 2 | 1.3M | R_0402 | R203, R305 |
| 25 | 100 | R_0402 | R204, R208, R302, R402, R413, R602, R603, R604 +17 |
| 1 | 4.64k | R_0402 | R205 |
| 1 | 25.5k | R_0402 | R206 |
| 1 | 2.2M | R_0402 | R303 |
| 1 | 115k | R_0402 | R306 |
| 1 | 27k | R_2512 | R401 |
| 32 | 10k | R_0402 | R403, R501, R601, R607, R608, R609, R610, R712 +24 |
| 1 | 0.16 | R_0805 | R404 |
| 1 | 1.5M | R_0603 | R405 |
| 1 | 14k | R_0402 | R406 |
| 1 | 27k | R_0603 | R407 |
| 1 | 22k | R_0402 | R408 |
| 1 | 1.6M | R_0402 | R410 |
| 1 | 330 | R_0402 | R411 |
| 1 | 3.3k | R_0402 | R412 |
| 1 | 1.96M | R_0402 | R701 |
| 1 | 255k | R_0402 | R702 |
| 2 | 1.21M | R_0402 | R703, R711 |
| 1 | 80.6k | R_0402 | R704 |
| 1 | 0 | R_0402 | R705 |
| 1 | 3.83M | R_0402 | R709 |
| 1 | 536k | R_0402 | R713 |
| 10 | 20k | R_0402 | R901, R902, R906, R907, R909, R910, R911, R912 +2 |
| 1 | 33k | R_0402 | R905 |
| 6 | 470k | R_0402 | R1003, R1004, R1011, R1012, R1019, R1020 |
| 6 | 22k | R_0805 | R1007, R1008, R1015, R1016, R1023, R1024 |
| 4 | 10 | R_0402 | R1204, R1210, R1211, R1215 |
| 2 | 200k | R_0805 | R1502, R1503 |
Nixie Clock design files
The KiCad project lives in the drewsum/Nixie_Clock repository on GitHub; these links point at the commit this page was built from.
Nixie Clock: common questions
What microcontroller does the Nixie Clock use?
The Nixie Clock is built around the PIC16LF1519-I/MV, from the PIC family.
How big is the Nixie Clock PCB?
The Nixie Clock measures 200 × 50 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Nixie Clock?
266 components, from 89 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 Nixie Clock design files?
From the drewsum/Nixie_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 Nixie Clock design in my own project?
The repository has no license, so all rights stay with drewsum. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Nixie Clock without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug PIC firmware against it before you order a PCB.
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