Very Simple Clock
Reworking a Design from 1971
Materials
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.
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Component list
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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