About the article

VFD-tube Clock with ESP32

with an accurate Internet-derived time

VFD-tube Clock with ESP32
Clocks built using vintage components are currently very popular. Most designs are based on a real-time clock, synchronized via radio time servers or GPS. The VFD clock described here uses an NTP server on the Internet to keep the time synchronized.
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Component list
Component List
Main Board
R1–R4 = 100Ohm
R5 = 33 Ohm
R6 = 2.2kOhm
R7 = 3.3kOhm
R8–R16 = 4.7kOhm
R17 = 10kOhm
R18,R19,R20 = 27kOhm
R21–R24 = 100kOhm
R25 = 220kOhm
P1 = 4.7kOhm preset (CB10LV472M)
P2 = 47kOhm preset (CB10LV473M)
C1 = 330pF, NP0
C2,C3 = 10nF
C4 = 4.7μF 100V, radial, low ESR
C5 = 100μF radial
C6,C7,C8 = 220μF, radial, low ESR
D1,D2 = 1N400x
D3 = MUR160G
D4 = 1N5819
D5 = 1N5347BG
T1 = BC547B
T2 = IPP200N15N3 G
T3–T9 = 2N7000
IC1 = PTH08080WAH
IC2 = ICM7555
IC3 = HV518P-G
IC4 = Würth type 173010578, 5V stepdown regulator
IC5 = DS18B20 (optional, not on the board)
MOD1 = ESP32-DevKitC + 2x20-pin pinheader
L1 = 47μH, 1.2A, 0.067Ohm, radial, ELC08D470E
F1 = polyfuse 0.5A, 60R050XPR
K1,K2,K3 = 10-pin pinheader, 0.1’’ pitch (2x5)
K4,K5 = 2-wayPCB screw terminal block, 5mm pitch
K6 = right-angled 3-way wire-to-board connector (Würth 61900319521) + female connector (optional)
K7 = right-angled 4-way wire-to-board connector (Würth 61900419521)
K8 = 4-way bus strip, 0.1’’ pitch
1 x SPST/NO pushbutton
1 x coaxial DC power connector 5.5/2.1mm (PC-010 TME)
red and black connecting wire
Display Board
R1,R2 = 3.3Ohm *
R3A,R4A,R3B,R4B = 100kOhm *
TU1–TU6 = IV-22 (Russian)
TU7,TU8 = DM160 or equivalent / IV-15 (Russian) *
K1,K2,K3 = right-angled pinheader 0.1’’ pitch
72 pcs tube socket pin 1mm
heatshrink sleeving, diameter 1.6mm 1:2 ratio
heatshrink sleeving, diameter 6mm 1:2 ratio
2 x (half) fuse holder 5x20 mm (Farnell 1866099)
Mechanical parts
2 x aluminum standoffs, round, 4.5x14mm (Ettinger 05.72.148)
2 x standoff, 15mm M3 F/F
4 x bolt M3x6 countersunk, steel, pozidriv DIN 7985A
8 x nylon bush M3
* see text
RGB Background Lighting Board
R1–R18 = 330 Ohm
D1–D6 = RGB-LED 5 mm, common anode (eBay)
K1 = 4-pin pinheader, 0.1’’ pitch
white, red, green and blue connecting wire + extra pinheader
heatshrink sleeving, 3.2mm 1:2 ratio
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