Week/Month Timer
Programmable for long periods
Materials
Gerber file
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Extra info / Update
Component list
R1 = 10M?
R2 = 270k?
R3 = 100k?
R4,R5,R7 = 10k?
R6 = 3k?3
Capacitors:
C1,C2 = 22pF
C3,C4 = 10nF
C5 = 1µF 16V radial
C6,C8 = 100nF
C7 = 100µF 16V radial
Semiconductors:
D1 = LED, high-efficiency, 2 mA
D2 = 1N4001
IC1 = 4541
IC2,IC4 = 4040
IC5 = 4068
IC6 = 555C (CMOS version)
Miscellaneous:
JP1 = jumper
K1,K2 = 12-way SIL pinheader
K3 = 8-way SIL pinheader
K4,K5 = 4-way SIL pinheader
S1 = pushbutton, 1 make contact
X1 = 32.768kHz quartz crystal
9-V PP3 (6R22) battery with clipon wires
PCB, available from The PCBShop
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