Article
Multicolour HD LED
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Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is fitted, its activity will not be visibly noticeable. This small circuit remedies that problem using a multicolour LED.
Materials
Gerber file
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PCB
Component list
Resistors:
R1,R3 = 10k
R2,R4 = 560
Semiconductors:
D1 = Dual LED with 3 pins (Conrad Electronics # 187496)
IC1,IC2 = CNY17-2
T1,T2 = BC547B
Miscellaneous:
K1 = 4-way SIL connector
Small disk drive connector for PCB mounting, or solder pins (see text)
PCB, order code 030117-1 from the PCBShop
R1,R3 = 10k
R2,R4 = 560
Semiconductors:
D1 = Dual LED with 3 pins (Conrad Electronics # 187496)
IC1,IC2 = CNY17-2
T1,T2 = BC547B
Miscellaneous:
K1 = 4-way SIL connector
Small disk drive connector for PCB mounting, or solder pins (see text)
PCB, order code 030117-1 from the PCBShop
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