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Quasi-Analog Clockwork

A Remake of an Elektor Classic

Quasi-Analog Clockwork
Quasi-Analog Clockwork
Mechanical timepieces have always had a certain appeal because of the beauty of the analog dial and its convenience in reading, despite their limitations in accuracy. On the other hand, the digital models are very accurate, but cold and impersonal. Why, then, not combine the two worlds as is done in this analog-looking digital watch design? Check out this kit!
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Materials

Products

Elektor Quasi-Analog Clockwork
Elektor Quasi-Analog Clockwork
€79.95
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Component list

Component List

Resistors

(body 2.5 × 6.8 mm)

R1, R22, R24 = 2.2 kΩ

R2 = 390 kΩ

R3, R5, R6, R7 = 82 kΩ

R4 = 1 kΩ

R8-R19 = 8.2 kΩ

R20 = 20 MΩ

R21 = 330 kΩ

R23 = 560 Ω

R25 = 470 Ω

R26 = 100 kΩ

 

Capacitors

C1...C4, C8...C18 = 100 nF, 50 V, ceramic X7R, pitch 5 mm

C5 =22 pF, 50 V, ceramic C0G/NP0, pitch 5 mm

C6 = 10 pF, 50 V, ceramic C0G/NP0, pitch 5 mm

C7 = 3...10 pF trimmer, BFC280823109 Vishay/BC Components

 

Semiconductors

D1, D13, D25, D37, D49, D61, D73,

D85, D97, D109, D121, D133 = LED, green, 3 mm

D2…D12, D14…D24, D26…D36, D38…D48, D50…D60,

D62…D72, D74…D84, D86…D96, D98…D108, D110…D120,

D122…D132, D134…D144, D162, D163 = LED, red, 3mm

 

Important: 3 mm round LED’s D1…D144 must have a flat side, no ledge!

 

D145…D156 = 1N4148, DO-35

D164 = 1N4004, DO-41

T1, T2 = BC547B

IC1 = CD4060, DIP-16

IC2 = 74HC21, DIP-14

IC3, IC4 = 74HC132, DIP-14

IC5, IC6 = 74HC4024, DIP-14

IC7…IC10 = 74HC4051, DIP-16

IC11 = 74HC4040, DIP16

 

Miscellaneous

K1 = 2-way PCB terminal block, 3.5 mm grid

S1 = 6 mm tactile pushbutton

X1 = 32.768 kHz crystal, 20 ppm, Cload 12.5 pF, 8 x 3 mm cylinder package (X32K768L104, AEL Crystals, pitch 1.1 mm)

Optional: DIP IC sockets, 14 contacts (IC2…IC6), 16 contacts (IC1, IC7...IC11)

PCB 240118-1

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