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Numitron Clock & Thermometer

Developed on the Arduino platform

Numitron Clock & Thermometer
The idea for this project was to take the Arduino world off of its Shields and Breadboards and out into a world of Elektor DIY projects while also hopefully appealing to the diehard AVR hackers. These worlds are so close but are so often treated as separate. The project happily combines today’s microcontroller technology with 1950’s Soviet tubes now available ‘NOS’ from Ebay.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
R1 = 0.18Ohm 3W
R2,R3,R7,R8,R9 = 10kOhm
R4,R5,R6 = 4.7kOhm
P1 = 4.7kOhm preset, top adjust
C1,C2,C6,C7,C8,C12,C13,C14,C15,C16 = 100nF
C3 = 100µF 25V radial
C4 = 220pF
C5 = 22µF 25V radial
C9 = 10µF 50V radial
C10,C11 = 22pF
L1 = 18uH choke, 3.4A, 0.036Ohm (Panasonic type ELC10D180E)
D1 = 1N5819
IC1 = 78L05
IC2 = MC34063
IC3 = ATmega328-PU, programmed, Elektor Store # 120740-41
IC4 = DS1307
IC5,IC6,IC7,IC8 = 74LS47
IC9 = DS1820
V1,V2,V3,V4 = IV-9 Numitron tube
JP1 = 2-pin pinheader + jumper cap, 0.1’’ pitch
X1 = 32.768kHz quartz crystal
X2 = 16MHz quartz crystal
MOD1 = BOB-FT232R (optional), Elektor Store # 110553-91
Bt1 = CR2032 battery
S1,S2 = pushbutton, SPST, chassis mount
K1 = power jack, 2.1mm, PCB mount
K2 = 6-pin (2x3) boxheader
La1 = 5V 300mW light bulb, GOW
PCB # 120740

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