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Very Simple Clock

Reworking a Design from 1971

Very Simple Clock
Electronics moves with the times. Over the years the options available change and there are ever different solutions to realising a certain concept. It is often the case that the amount of integration is increased as much as is possible. A good example is this Very Simple Clock. This clock is based on the Hebinck-clock that was published in the May and June 1971 issues of Elektor Netherlands (the design was never published in the English-language edition, which first appeared in 1975).
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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.

Resistors
R1-R8 = 100
R9 = 10k
Capacitors
C1,C2 = 22pF
C3 = 220µF 25V radial
C4 = 47µF 16V radial
C5,C6,C7 = 100nF
Semiconductors
D1-D24 = LED, 5mm, high intensity
D25-D28 = LED, 3mm, high intensity
B1 = B40C1500R (round case ) (40V piv, 1.5A)
IC1 = PIC16F628-20/P, programmed, order code 060350-41
IC2 = 7805
Miscellaneous
DCF receiver module, Conrad Electronics # 641138
K1 = 2-way PCB terminal block, lead pitch 5mm
X1 = 16MHz quartz crystal
PCB, ref. 060350-1 from ThePCBShop
PIC source and hex code files, free download # 060350-11
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