Luc Lemmens
About the article

Beat the Elektor Pinball Clock!

Ah… the sound of them score drums rolling …

Beat the Elektor Pinball Clock!
Sure, Elektor presented numerous projects and Retronics flashbacks on 'vintage’ display devices like Nixie tubes, Numitrons, Dekatrons, VFD tubes, but so far just one thermometer project appeared that used electromechanical (EM) pinball score reels units [1], followed by a remake with a pinball credit reel unit to display temperature [2]. High time for a follow-up! This time, let’s make a clock with score reels.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.
Component list

Component List


R1,R2,R8,R9,R11,R23,R26 = 10kΩ, thick film, 5%, 0.1W, 150V

R3,R6,R10,R12,R19,R21,R24 = 100Ω, thick film, 5%, 0.1W, 150V

R4 = 2.7kΩ, thick film, 5%, 0.1W, 150V

R5 = 1k6Ω, thick film, 1%, 0.1W, 150V

R7,R15,R16,R17,R18,R20,R22,R25,R27 = 1kΩ, thick film, 5%, 0.1W, 150V

R13,R14 = 4.7kΩ, thick film, 5%, 0.1W, 150V



C1 = 4700µF, 50V, 10mm pitch, 22x41mm

C2,C6,C7,C8 = 100nF, 50V, X7R, 0805

C3,C4 = 100µF, 16V, 2312

C5 = 10µF, 16V, 1206



L1 = 470µH power Inductor (SMD), 570mA, shielded, 270mA, MSS7341T series



D1,D2,D3,D4 = S3J+, 600V, 3A

D5 = MBRS540, 40V, 5A, Vf=550mV @ If=5A

LED1 = green, 3mm

LED2 = red, 3mm

T1,T2,T3,T4,T5,T6,T7 = NTF3055L108T1G MOSFET, n-channel, 3A, 60V, 120mΩ

IC1 = LM2576HVS-ADJ, step-down regulator, 4-60V, 3A

IC2 = DS3231MZ+ RTC, I2C, 5ppm

IC3 = MCP23008-E/SO, 8-bit I2C I/O expander

MOD1 = ESP-12F, ESP8266-based Wi-Fi module


Miscellaneous and/or not on PCB

Bt1 = CR2032 battery, with holder, e.g. Keystone 1066

D6,D7,D8,D9,D10,D11,D12 = 1N4007, 1000V, 1A (not on PCB!)

F1 = 2AT fuse, 5x20mm, with holder, PCB mount, pitch 22.6mm

F2 = 160mAT fuse, 5x20 mm  (230V mains) with holder, panel mount, solder terminals

F2 = 320mAT fuse, 5x20 mm (115V mains) with holder, panel mount, solder terminals

K1 = 6-pin pinheader, 0.1" pitch, vertical

K2 = 5-way PCB screw terminal block, 0.2" pitch, 630V

K3,K4 = 2-way PCB screw terminal block, 0.2" pitch, 630V

K5 = 4-way PCB screw terminal block, 0.2" pitch, 630V

K6 = 4-pin pinheader, 0.1" pitch, vertical

LCD1 = 0.96" Inch 128x64 OLED LCD Display for Arduino (optional)

R28,R29,R30,R31 = 1.2 kΩ, carbon film, 5%, 0.25W, 250V (not on PCB!)

S1 = switch, tactile feedback, e.g. SKHHLVA010

S2 = switch, tactile feedback, 12V, 50mA, Multicomp TM series

Tr1 = transformer, toroidal, 2x12V, 30VA, e.g. Multicomp MCTA030/12

Power entry connector, IEC320 C8 + cable

PCB 180307-1 V3.1

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