LED Roulette
using LEDs instead of a ball
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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Extra info / Update
Component list
R1-R40 = 1kOhm
R41-R43 = 10kOhm
Capacitors:
C1,C2 = 22pF
C3-C10 = 100nF
C11 = 10µ F 16V radial
C12 = 1µ F 16V radial
Semiconductors:
D1,D38,D40 = LED, 3mm, green, low current
D2,D4,D6,D8,D10,D12,D14,D16,D18,D20,D22,D24,D26,D28,D30,D32,D34,D36,D39 = LED, 3mm, yellow, low current
D3,D5,D7,D9,D11,D13,D15,D17,D19,D21,D23,D25,D27,D29,D31,D33,D35,D37 = LED, 3mm, red, low current
IC1 = 89C2051-12PC, programmed, order code 030168-41
IC2-IC6 = 74HCT373
IC7 = 7805CP (TO-220 case)
Miscellaneous:
K1 = 9V battery with clip and on/off switch (optional)
S1 = pushbutton with make contact
S2 = on/off switch
X1 = 12MHz quartz crystal
PCB, order code 030168-1
Disk, contains source and hex code files, order code 030168-11 or Free Download
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