Intelligent Fan Timer
Using the MSP430 low-power processor

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Materials
Gerber file
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Component list
R1 = 8k?2
R2,R5,R7,R8,R10 = 10k?
R3,R4 = 47k?
R6 = 1k?
R9 = 270k?
Capacitors:
C1 = 47nF 400V, Class X2
C2 = 220µF 16V radial
C3-C6 = 100nF
Semiconductors:
D1,D4-D11,D14 = 1N4007
D2 = zener 3 V/500 mW
D3,D13 = BYV10
D12 = 1N4148
T1 = BC327
THY1 = TIC106D
LD1 = HD1105-O
IC1 = MSP430F1121, programmed, order code 020170-41
Miscellaneous:
K1,K2 = 2-way PCB terminal block, lead pitch 7.5mm
F1 = fuse, 500 mAT (time lag), with PCB mount holder
S1 = pushbutton, 1 make contact, Class 2 (for test purposes only)
S2 = pushbutton, 1 make contact, Class 2, e.g., Omron type A3DT-7111 with cap A3DT-500R (Farnell)
Tr1 = approx. 20 turns, bifilar, on Philips core TN14/9/5 (material: 3C85)
Enclosure: e.g., Hammond type 1591B (red)
Disk, project software, order code 020170-11 or Free Download
PCB available from The PCBShop
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