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Binary Clock

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Binary Clock
This design is based on the binary clock on display in a German museum the author happened to visit. It functional replica is based on a PIC microcontroller.
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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-R4,R12 = 220?
R5-R10 = 1k?
R11 = 390?
R13,R14,R15 = 4k?7
R16 = 10k?
Capacitors:
C1,C2,C5 = 100nF
C3 = 470?F 25V radial
C4 = 47?F 16V radial
C6 = 10?F 16V radial
C7,C8 = 15pF
Semiconductors:
B1 = B80C1500 (80V piv, 1.5A)
D1-D20 = LED, low current, colour to personal taste
D21 = LED
D22,D23 = 1N4148
D24 = zener diode 4.7V, 0.5W
IC1 = LM7805
IC2 = PIC16C54-04/P (programmed, order code 020390-41)
T1-T6 = BC550C
Miscellaneous:
K1 = 2-way PCB terminal block, lead pitch 5mm
S1,S2 = pushbutton, 1 make contact
X1 = 4MHz quartz crystal
Project software on disk: order code 020390-11 or Free Download
PCB, order code 020390-1 from The PCBShop
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