Isn't it shiny!
It uses the 12v line to power the ring LED. I had an idea that instead of drilling another hole in the case of the flimsy lunch box tin, I should just make the power LED flash off when there is HDD activity. However the first problem is how to power off a LED when another line goes high? Looks like a Not logic gate (inverter) would solve that one. 2nd problem is that the HDD activity LED would normally be 5v and my shiny power LED is 12v. So something called a Darlington pair should hopefully solve this problem. So putting the two concepts together I have arrived at this circuit.
Any comments on improvements? Is the resistor on the ground too much? I though that it may protect the 5v rails from the 12v rail, as the 5v rail is signals only, and the 12v rail is the one with the actual load.
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