Binary Clock

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Published in issue 356, July 2006

Resistors:

R1-R4,R12 = 220Ω

R5-R10 = 1kΩ

R11 = 390Ω

R13,R14,R15 = 4kΩ7

R16 = 10kΩ

Capacitors:

C1,C2,C5 = 100nF

C3 = 470μF 25V radial

C4 = 47μF 16V radial

C6 = 10μF 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