This lab involves building a 6-digit electronic desktop Nixie clock featuring vintage Russian cold-cathode numerical display tubes (IN-14) and neon glow lamps (IN-3). The hardware platform consists of a custom two-layer PCB hosting an 8-bit Microchip/Atmel ATmega328P microcontroller running at 5 V logic, a Maxim DS3231 high-precision real-time clock (RTC) backed by a 3 V CR2032 lithium coin cell, and two cascaded Microchip/Supertex HV5622 32-channel high-voltage shift registers (providing 64 push-pull/open-drain outputs to drive tube cathodes directly without multiplexing). The clock operates from an external 12 V DC power supply via a 2.1 mm barrel jack, regulates the 12 V down to 5 V using an on-board LM78L05 linear regulator for logic circuitry, and passes the 12 V rail to an external high-voltage DC-DC boost converter module (NCH6100HV) that steps the voltage up to an adjustable ~160 V to 170 V DC high-tension rail ("HT") to bias the Nixie tube anodes.

Bill of Materials

Active Integrated Circuits and Regulators

• IC1: ATmega328P 8-Bit Microcontroller

  • Identity: Microchip / Atmel ATMEGA328P-AU (Schematic label: ATMEGA328P-M)
  • Quantity: 1
  • Footprint: Housings_QFP:LQFP-32_7x7mm_Pitch0.8mm (32-pin TQFP / LQFP, 7 mm × 7 mm, 0.8 mm pin pitch)
  • Electrical constraints: Operating voltage 5.0 V DC (connected to +5 V and GND nets). Must function from 1.8 V to 5.5 V at clock frequencies up to 20 MHz.
  • Substitution latitude: Must be an ATmega328P in a 32-pin TQFP package (pinout-compatible with ATmega328P-AU). ATmega88 or ATmega168 are pin-compatible but lack the flash memory required for the compiled binary.
  • User control: No.
  • Sourcing plan: distributor lookup: ATMEGA328P-AU

• U1: DS3231 Extremely Accurate I2C-Integrated RTC / TCXO

  • Identity: Maxim Integrated / Analog Devices DS3231SN# (Schematic label: DS3231N)
  • Quantity: 1
  • Footprint: SMD_Packages:SO-16-L (16-pin SOIC Wide body, 300 mil / 7.5 mm width, 1.27 mm pitch)
  • Electrical constraints: Primary VCC powered from the +5 V rail. VBAT pin connects to a 3 V CR2032 lithium battery (BT1). Communicates via I2C at 5 V levels. Pin 3 (!INT/SQW) routes to MCU pin PB0.
  • Substitution latitude: Must be an exact DS3231 or DS3231S in a 16-pin SOIC wide package. The firmware communicates with the internal register map of the DS3231 over I2C and reads internal temperature registers; standard pinout RTCs (e.g., DS1307) are pin-incompatible and will not work.
  • User control: No.
  • Sourcing plan: distributor lookup: DS3231SN#

• U2, U3: HV5622 32-Channel High-Voltage Shift Register

  • Identity: Microchip Technology / Supertex HV5622PG-G
  • Quantity: 2
  • Footprint: Housings_QFP:LQFP-44_10x10mm_Pitch0.8mm (44-pin LQFP, 10 mm × 10 mm body, 0.8 mm pin pitch)
  • Electrical constraints: Logic supply VDD is +5 V DC. High-voltage outputs (HV1 to HV32) must withstand up to 220 V DC absolute maximum (operating on ~160 V to 170 V Nixie cathode switching).
  • Substitution latitude: Must be the HV5622PG-G (or compatible Supertex HV5522 / HV5622 in 44-lead PQFP/LQFP). The PCB layout routes 64 discrete high-voltage open-drain output channels directly to tube cathodes; no generic shift register can withstand the 160 V switching voltage.
  • User control: No.
  • Sourcing plan: distributor lookup: HV5622PG-G

• U4: LM78L05 5 V / 100 mA Positive Voltage Regulator

  • Identity: ON Semiconductor / Texas Instruments MC78L05ACZX or LM78L05ACZ/NOPB (Schematic label: 78L05)
  • Quantity: 1
  • Footprint: TO_SOT_Packages_THT:TO-92_Inline_Wide (TO-92 through-hole, wide inline pin spread)
  • Electrical constraints: Input voltage 12 V DC (from CON1 / Pin 1 of P2). Output voltage fixed 5.0 V DC (tolerances 4.75 V to 5.25 V), output current rating ≥ 100 mA.
  • Substitution latitude: Any standard 78L05 positive 5 V linear regulator in a TO-92 package with standard pinout (Pin 1: VOUT, Pin 2: GND, Pin 3: VIN) is acceptable.
  • User control: No.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): LM78L05ACZ/NOPB

Cold-Cathode Display Tubes and Indicator Lamps

• N1, N2, N3, N5, N6, N7: IN-14 Numerical Nixie Display Tubes

  • Identity: Vintage Soviet/Russian IN-14 (ИН-14) side-view cold-cathode neon display tube
  • Quantity: 6
  • Footprint: russian-nixies:russian-nixies-IN-14 (circular pin footprint on PCB bottom layer; mounted via socketed machine-tooled pins)
  • Electrical constraints: Anode strike/firing voltage ~170 V DC; sustaining voltage ~140 V to 150 V DC. Nominal cathode current 2 mA to 2.5 mA DC. Pinout includes numbers 0 through 9 and left/right decimal points.
  • Substitution latitude: Must be Russian IN-14 Nixie tubes to match the PCB footprint geometry, lead configuration, and physical envelope height/diameter.
  • User control: No.
  • Sourcing plan: retail shopping search: IN-14 nixie tube lot

• N4, N8: IN-3 Subminiature Neon Glow Lamps

  • Identity: Vintage Soviet/Russian IN-3 (ИН-3) miniature neon indicator lamps (used as digit separator / colon indicators)
  • Quantity: 2
  • Footprint: russian-nixies:russian-nixies-IN-3 (2-pin wire terminal footprint on PCB top layer)
  • Electrical constraints: Firing voltage 60 V to 90 V DC; operating current ~0.5 mA to 1.0 mA DC. Anode connected via current-limiting resistor to HT (~160 V), cathode switched via shift register output. Polarized device (arrow at base points from anode to cathode).
  • Substitution latitude: Standard IN-3 neon indicator bulbs. Any subminiature radial neon bulb (e.g., NE-2 or A9A) with comparable firing voltage and lead spacing can mechanically substitute if polarity is observed.
  • User control: No.
  • Sourcing plan: retail shopping search: IN-3 neon indicator lamp

Resistors

• R1, R4, R5, R6, R9, R10: IN-14 Anode Current-Limiting Resistors

  • Identity: 27 kΩ, 1/4 W (or 1/8 W) 5% carbon film or metal film through-hole resistor
  • Quantity: 6
  • Footprint: Resistors_ThroughHole:Resistor_Vertical_RM5mm (through-hole, 5.0 mm vertical lead spacing)
  • Electrical constraints: Sits directly on the HT rail (~160 V to 170 V DC) to the tube anodes. Power dissipation at 2.5 mA is approximately 0.17 W. Working voltage rating must be ≥ 200 V DC.
  • Substitution latitude: Any standard 27 kΩ through-hole resistor rated for ≥ 200 V and ≥ 0.25 W that fits 5 mm vertical mounting.
  • User control: No.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): CFR-25JR-52-27K

• R2, R7: IN-3 Neon Bulb Current-Limiting Resistors

  • Identity: 100 kΩ (schematic/PCB netlist value) or 120 kΩ (text description in directions.md), 1/4 W 5% through-hole resistor
  • Quantity: 2
  • Footprint: Resistors_ThroughHole:Resistor_Vertical_RM5mm (5.0 mm vertical lead spacing)
  • Electrical constraints: Current limiter on HT rail (~160 V DC) for IN-3 neon indicators. Max voltage ≥ 200 V DC.
  • Discrepancy: The KiCad schematic and board netlist specify 100 kΩ (100K). The assembly manual directions.md explicitly lists them as 120 kΩ. Both provide suitable current limiting for miniature neon lamps at 160 V DC; prefer the board netlist value of 100 kΩ (or 120 kΩ).
  • Substitution latitude: Standard 100 kΩ to 120 kΩ through-hole resistors rated ≥ 200 V and ≥ 0.25 W.
  • User control: No.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): CFR-25JR-52-100K

• R3, R8: I2C Bus Pull-Up Resistors

  • Identity: 4.7 kΩ, 1/8 W or 1/4 W 5% through-hole resistor
  • Quantity: 2
  • Footprint: Resistors_ThroughHole:Resistor_Vertical_RM5mm (5.0 mm vertical lead spacing)
  • Electrical constraints: Pulls up I2C bus lines SDA and SCL to the +5 V rail. Low power dissipation (< 10 mW).
  • Substitution latitude: Any 4.7 kΩ through-hole resistor fitting 5 mm vertical spacing. Values from 2.2 kΩ to 4.7 kΩ are acceptable for standard I2C operation.
  • User control: No.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): CFR-25JR-52-4K7

• R11: Microcontroller Hardware Reset Pull-Up Resistor

  • Identity: 10 kΩ, 1/8 W or 1/4 W 5% through-hole resistor
  • Quantity: 1
  • Footprint: Resistors_ThroughHole:Resistor_Vertical_RM5mm (5.0 mm vertical lead spacing)
  • Electrical constraints: Pulls up pin 29 (!RESET) of IC1 to the +5 V rail.
  • Substitution latitude: Any 10 kΩ (4.7 kΩ to 10 kΩ acceptable) through-hole resistor fitting 5 mm vertical spacing.
  • User control: No.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): CFR-25JR-52-10K

Capacitors

• C1, C4, C5: Logic Decoupling and Regulator Output Capacitors

  • Identity: 0.1 µF (100 nF), 50 V ceramic disc or multilayer ceramic capacitor
  • Quantity: 3
  • Footprint: Capacitors_ThroughHole:C_Disc_D3_P2.5 (radial through-hole disc, 3 mm diameter, 2.5 mm lead pitch)
  • Electrical constraints: Decoupling for MCU VCC (C1), DS3231 VCC (C4), and LM78L05 output (C5). All sit across +5 V and GND rails. Voltage rating ≥ 16 V DC (50 V recommended).
  • Substitution latitude: Any 0.1 µF ceramic radial through-hole capacitor with 2.5 mm lead pitch.
  • User control: No.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): K104K15X7RF53L2

• C2, C3: Crystal Oscillator Load Capacitors

  • Identity: 22 pF, 50 V C0G/NP0 ceramic disc capacitor
  • Quantity: 2
  • Footprint: Capacitors_ThroughHole:C_Disc_D3_P2.5 (radial through-hole disc, 3 mm diameter, 2.5 mm lead pitch)
  • Electrical constraints: Load capacitance for crystal Y1 connected between XTAL1/XTAL2 pins and GND. Low-drift dielectric (C0G/NP0) required.
  • Substitution latitude: Any 18 pF to 22 pF C0G ceramic through-hole capacitor with 2.5 mm pitch.
  • User control: No.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): C315C220J5G5TA

Frequency Reference & Battery

• Y1: Quartz Crystal Resonator

  • Identity: HC-49/U or HC-49/US through-hole quartz crystal resonator
  • Quantity: 1
  • Footprint: Crystals:Crystal_HC49-U_Vertical (HC-49 vertical through-hole, 4.88 mm pin pitch)
  • Electrical constraints: Connected to ATmega328P pins 7 and 8 (XTAL1/XTAL2). Note: The schematic specifies only "Crystal" without a rated frequency; the firmware build script defines F_CPU=1000000UL (1 MHz, compatible with factory internal RC fuses). If an external resonator is activated, standard 16.000 MHz (or 8.000 MHz) HC-49/S crystals with 18 pF load capacitance are typical for ATmega328P.
  • Substitution latitude: Standard HC-49/U or HC-49/US quartz crystal matching firmware clock fuses.
  • User control: No.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): ABLS-16.000MHZ-B4-T

• BT1: CR2032 Lithium Coin Cell Holder and Battery

  • Identity: Linx Technologies BAT-HLD-001 (Coin cell battery holder for CR2032) and 3 V CR2032 battery
  • Quantity: 1
  • Footprint: nixie:CR2032 (surface mount / through-hole hybrid coin cell retention clip)
  • Electrical constraints: 3.0 V nominal DC lithium primary battery connected to pin 14 (VBAT) of DS3231 RTC.
  • Substitution latitude: Must fit the nixie:CR2032 footprint geometry (Linx BAT-HLD-001 or equivalent 20 mm coin cell holder).
  • User control: Battery replacement only.
  • Sourcing plan: distributor lookup: BAT-HLD-001

Connectors, Switches, and Hardware

• CON1: 2.1 mm DC Barrel Power Jack

  • Identity: 2.1 mm ID × 5.5 mm OD center-positive DC power receptacle, through-hole PCB mount
  • Quantity: 1
  • Footprint: Connect:BARREL_JACK (standard 3-pin PCB barrel jack footprint)
  • Electrical constraints: Rated for ≥ 12 V DC, ≥ 1.5 A. Pin 1 connects to +12V rail; pins 2 and 3 connect to GND.
  • Substitution latitude: Any standard PCB-mount 2.1 mm × 5.5 mm DC barrel jack matching the pad spacing (e.g., CUI Devices PJ-102A).
  • User control: Power input plug insertion.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): PJ-102A

• P1: AVR In-System Programming (ISP) Header

  • Identity: 2×3 pin, 0.100" (2.54 mm) pitch straight male unshrouded pin header
  • Quantity: 1
  • Footprint: Pin_Headers:Pin_Header_Straight_2x03
  • Electrical constraints: Carries MISO, 5V, SCK, MOSI, RESET, and GND for flashing the ATmega328P.
  • Substitution latitude: Standard 0.1" 2×3 male header strip.
  • User control: Programming interface.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): 67997-206HLF

• P2: High-Voltage / Power Connector to Boost Board

  • Identity: 1×3 pin, 0.100" (2.54 mm) pitch straight male pin header
  • Quantity: 1
  • Footprint: Pin_Headers:Pin_Header_Straight_1x03
  • Electrical constraints: Pin 1 carries +12 V DC; Pin 2 carries GND; Pin 3 carries high voltage ~160 V to 170 V DC (HT).
  • Substitution latitude: Standard 0.1" (2.54 mm) 1×3 header. Clearance between Pin 2 (GND) and Pin 3 (HT ~170 V) is 0.1" (2.54 mm).
  • User control: Inter-board wiring interconnect.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): 68000-103HLF

• SW1, SW2, SW3: Right-Angle Tactile Push Buttons

  • Identity: SPST Normally Open Right-Angle Through-Hole Tactile Pushbutton Switch
  • Quantity: 3
  • Footprint: Buttons_Switches_ThroughHole:SW_Tactile_SPST_Angled (side-actuated 6 mm tactile switch)
  • Electrical constraints: Switches logic signals to ground against ATmega328P internal pull-up resistors (5 V logic, < 1 mA).
  • Operational role: Student/user operated controls during normal clock operation. SW1 cycles clock modes (Time, Date, Temperature, Timer); SW2 acts as Increment/Right/Reset; SW3 acts as Start-Stop/Left/Hour adjustment. The right-angle actuator orientation is mandatory so buttons protrude through the clock enclosure wall.
  • Substitution latitude: Standard 6 mm × 6 mm right-angle PCB tactile pushbutton switch with matching pin layout.
  • Sourcing plan: distributor lookup (representative example — sources give spec only): PTS645VL39-2 LFS

• Mounting Holes (REF**): Mechanical Board Standoff Points

  • Identity: 4-40 clearance drill holes on PCB
  • Quantity: 4 (located on layout at positions [25.4, 100.6], [77.6, 70.7], [132.6, 70.6], [166.5, 91.3] mm)
  • Footprint: Connect:1pin (drill diameter ~0.120" / 3.05 mm)
  • Support hardware: Sized for 4× 4-40 machine screws and 4× 4-40 hex nuts.
  • Substitution latitude: Standard 4-40 or M3 mounting hardware.
  • User control: Mechanical chassis mount.
  • Sourcing plan: retail shopping search: 4-40 machine screws and nuts

Off-Board Hardware, External Modules, and Enclosure

• NCH6100HV High-Voltage DC-DC Boost Power Supply Module

  • Identity: NCH6100HV Miniature High-Voltage DC Power Supply Module (or equivalent Nixie boost converter)
  • Quantity: 1
  • Electrical constraints: Accepts 12 V DC input; outputs regulated, potentiometer-adjustable 85 V to 235 V DC (adjusted to ~160 V to 170 V DC for IN-14 tubes); output current capability ≥ 20 mA.
  • Substitution latitude: Any compact DC-DC boost converter module accepting 12 V DC and outputting 160 V to 180 V DC with sufficient current capacity (≥ 20 mA) to power 6 IN-14 tubes simultaneously.
  • User control: On-module trim potentiometer set once during calibration.
  • Sourcing plan: retail shopping search: NCH6100HV high voltage nixie power supply module

• Machine-Tooled Female Header Pins (Tube Sockets)

  • Identity: Individual machined female receptacle contact pins extracted from 0.1" (2.54 mm) machined IC socket strips
  • Quantity: 60 contact pins (10 to 11 pins per IN-14 tube across 6 tubes)
  • Mechanical constraints: Outer pin diameter must fit inside PCB tube footprint holes (drill ~0.033" / 0.84 mm); inner contact spring accepts 0.4 mm to 0.5 mm Nixie tube wire leads.
  • Substitution latitude: Standard round machined IC socket headers (e.g., Mill-Max or generic round-hole SIP strips) broken open to extract pins.
  • User control: Assembly socketing.
  • Sourcing plan: retail shopping search: 2.54mm round machined female pin header strip

• 12 V DC Wall Adapter Power Supply

  • Identity: AC-to-DC Regulated Wall Adapter, 12 V DC output, minimum 1.0 A rating, terminated in a 2.1 mm ID × 5.5 mm OD center-positive barrel plug
  • Quantity: 1
  • Electrical constraints: Must provide stable 12 V DC under load (supplying both the 5 V logic regulator and the high-voltage boost module).
  • Substitution latitude: Any 12 V DC supply rated ≥ 1.0 A with a matching 2.1 mm center-positive plug.
  • User control: Wall plug.
  • Sourcing plan: retail shopping search: 12V 1A power supply 2.1mm center positive

• Interconnect Wires

  • Identity: 3-conductor wire jumper harness with 0.1" female Dupont sockets on each end (to bridge header P2 to the NCH6100HV module)
  • Quantity: 1 harness (3 wires: +12V, GND, HT)
  • Electrical constraints: HT wire carries up to 170 V DC; insulation rating must be ≥ 300 V.
  • Substitution latitude: Standard 22–26 AWG hookup wire with 0.1" crimp connectors.
  • User control: Internal wiring.
  • Sourcing plan: retail shopping search: female to female dupont jumper wire

• Custom Enclosure

  • Identity: Custom fabricated chassis (wood, 3D-printed, CNC-machined, or laser-cut acrylic/plywood) designed to enclose both the 148 mm × 37 mm main board and the NCH6100HV module with top cutouts for the 6 IN-14 tubes and 2 IN-3 lamps, plus side openings for 3 pushbuttons and the DC barrel jack.
  • Quantity: 1
  • Substitution latitude: Custom enclosure constructed per student preference based on the PCB outline dimensions.
  • User control: Physical housing.
  • Sourcing plan: retail shopping search: custom nixie clock enclosure materials

Software and network dependencies

This lab runs firmware compiled into C binary form for an Atmel ATmega328P microcontroller and uses no network connectivity. The clock operates entirely offline with no wireless, Ethernet, or USB gadget network interfaces.

• Microcontroller Firmware:

  • Name: NixieCode (thernext123 / Jeffrey Ni)
  • Source: Included within lab archive as nixie-clock-code.zip and available at repository https://github.com/njeff/nixie-clock
  • Version: not stated
  • Version source: not stated in the sources
  • Toolchain / IDE: Atmel Studio 6.2 / 7.0 C project (NixieCode.atsln, NixieCode.cproj) targeting device ATmega328P with symbol F_CPU=1000000UL pinned in NixieCode.cproj
  • Manifest location: NixieCode/NixieCode/NixieCode.cproj
  • Check plan: not checkable: embedded AVR C source project with no package registry or security advisory tracking

• Integrated Firmware Libraries (Vendored):

  • Zak Kemble AVR millis library (millis.c, millis.h): Timer 1 interrupt-driven tick provider. Upstream repository https://github.com/zkemble/millis. Version: not stated (vendored directly into project tree without git tag or manifest).
  • akafugu DS3231 RTC / TWI driver library (rtc.c, rtc.h, twi.c, twi-lowlevel.c): Hardware I2C/RTC communication driver. Upstream repository https://github.com/akafugu/ds_rtc_lib. Version: not stated (vendored directly into project tree).
  • Version pinning: Unpinned. Both third-party libraries are vendored as loose C source files in NixieCode/NixieCode/ with no version constraints or release tags specified.
  • Check plan: not checkable: vendored C libraries without external package manifests or advisory databases

• Flashing Toolchain Utility:

  • Name: avrdude
  • Purpose: ISP programmer utility invoked via program_328p.bat using the command avrdude -p m328p -c usbasp -e -U flash:w:NixieCode.hex
  • Version: not stated
  • Programmer hardware: USBasp (or standard AVRISP mkII) connected to header P1
  • Check plan: not checkable: local binary utility with unpinned version

• Network Exposure:

  • Network connectivity: None. The system has no Wi-Fi, Ethernet, Bluetooth, or cellular hardware. No network stack is implemented. The device listens on no network ports and uses no default credentials.

External URLs and Remote Resources

• GitHub Firmware & KiCad Repository: https://github.com/njeff/nixie-clock (Primary repository hosting source code and design files).
• OSHPark Shared PCB Project: https://oshpark.com/shared_projects/nlSfLdLr (Community board fabrication link).
• Instructables Lab Documentation: https://www.instructables.com/id/SMD-Nixie-Clock/ (Author project build log and photos).
• Upstream Library Repositories:
  • https://github.com/zkemble/millis (AVR millis library)
  • https://github.com/akafugu/ds_rtc_lib (Akafugu DS3231 RTC library)
• Vintage Component eBay Listings referenced in documentation (historical URLs subject to link rot):
  • http://www.ebay.com/itm/Lot-of-6pcs-IN-14-NIXIE-TUBES-100-GARANTY-WORKING-IN14-/141770629073
  • http://www.ebay.com/itm/10pcs-IN-3-NOS-NIXIE-TUBES-100-GARANTY-WORKING-IN3-INS-1-IN-14-IN-18-/141804242605
  • http://www.ebay.com/itm/Authorized-Dealer-NCH6100HV-High-Voltage-DC-Power-Supply-for-Nixie-Tubes-/182031863746

Fabrication Specifications

• CAD Suite: KiCad PCBNEW (v4.0.0-rc1-stable)
• Board Outline Dimensions: 148.08 mm × 37.08 mm (5.83 in × 1.46 in)
• Layer Count: 2 copper layers (F.Cu Front Copper, B.Cu Back Copper)
• Substrate Material & Thickness: Standard FR4, 1.6 mm board thickness, 1 oz (35 µm) copper weight
• Surface Finish: Lead-Free HASL or ENIG (recommended due to 0.8 mm pitch QFP ICs)
• Solder Mask / Silkscreen: 2-sided solder mask (F.Mask, B.Mask) and 2-sided silkscreen (F.SilkS, B.SilkS)
• Minimum Trace Width / Clearance: User trace widths 0.381 mm (signal) and 1.27 mm (power/HT); trace clearance 0.2 mm. Note: Designers reproducing this board should ensure high-voltage clearance (creepage and clearance) is maintained between the ~170 V HT traces/pads and adjacent 5 V / GND nets.
• Drill / Hole Counts:
  • Vias: 0.6 mm diameter pad, 0.4 mm drill (0.016")
  • IN-14 / Machine Header Holes: 0.033" (0.84 mm) drill
  • Mounting Holes: 4× 0.120" (3.05 mm) unplated/plated mechanical drill holes sized for 4-40 screws
• Fabrication File Outputs: 8 standard RS-274X Gerber files and 1 Excellon drill file contained in PCB/Gerber/ (nixie-F_Cu.gbr, nixie-B_Cu.gbr, nixie-F_Mask.gbr, nixie-B_Mask.gbr, nixie-F_SilkS.gbr, nixie-B_SilkS.gbr, nixie-Edge_Cuts.gbr, nixie.drl). Ready for direct submission to any standard commercial PCB manufacturer.