About the article

Multicolour HD LED


Multicolour HD LED
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.
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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1,R3 = 10k
R2,R4 = 560
D1 = Dual LED with 3 pins (Conrad Electronics # 187496)
IC1,IC2 = CNY17-2
T1,T2 = BC547B
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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