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Cold Cathode Hard Drive indicator

This is more along the lines of a mod, but if I can get it done it would be awesome.

I want to use a cold cathode tube to act as my hard drive indicator light. In trying to come up with the way to do it, I have figured out the following:

1. the power source from the Hard drive Inicator pins on the mb is not strong enough to turn on the light.

2. the cold cathode has a power switch, and I am trying to figure out if I take the two wires from the power switch and connect them to the HD indicator pins on my pc, would it fry my motherboard, or woould it complete the circuit when the signal comes that there is hard drive activity.

3. I realize that power is coming out of the Indicator pins on the mb, but would power from the cold cathode be passing through my mainboard if I connected light switch to the indicator pins.


If I am thinking of this wrong, let me know, and if anyone has suggestions, (that won't fry my pc!!) feel free to comment.

Thanks,
Leo II
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mrleowashingtonII
Asked:
mrleowashingtonII
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1 Solution
 
_Commented:
It's been awhile since I hacked electronics, but:

#2 The wires to the switch are just one line, if you hook them to the mobo header pins, either nothing will happen, or you will try to run power into the mobo, depending on what you do with the other end of one of the Switch wires (positive), and the common (ground) from the CCR.

The best thing is to build/buy a circuit the will let the mobo pins open a "gate" switch to run a larger power source to the CCR. I can't think of the name right now, but what it does is let a small current (mobo pins) control a larger current (CCR source), while keeping them seperate.
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mrleowashingtonIIAuthor Commented:
The part that you are referring to is a relay, and I went and found one at the shack that does 12 volts ( which is what goes into the inverter for the CCR) for $4.49. I will go ahead and close this one now and give you youir points...
Just a note, it is hard to believe that there is no mod site that returned on google for a mod like this.. or maybe I am just weird!
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_Commented:
Thank you much.    : )

>> or maybe I am just weird <<   Naaaa. Just ahead of the pack.  ; )
Sounds like a nice mod. You should see some of the stuff CPU readers do.
www.computerpowerusers.com >
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_Commented:
Sorry, no "S" in it.

www.computerpoweruser.com >
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mwnnjCommented:
Hi mrleowashingtonII,
as coral ,you must make yourself an active circuit,i suppose it should be an amplifying circuit,probably using MOS transistors ,to get the whole scenario working...
>>2. the cold cathode has a power switch, and I am trying to figure out if I take the two wires from the power switch and connect them to the HD indicator pins on my pc, would it fry my motherboard, or woould it complete the circuit when the signal comes that there is hard drive activity<<
if you do not have additional power source ,e.g. like batteries or something ,after connecting the cold cathode it should take only current from your motherboard and supply it to the resistor,e.g the 'neon' light tube ,so there is nothing to revert more power to your motherboard,as coral;
it is the same issue as you use neon or cold cathode light fan,you just simply add it to right plug on your motherboard and it's working like a normal fan,if it's reverting more power to your motherboard ,then adding two or three of them should make the whole thing unstable for sure ,so case modding should be a really dangerous 'game'...
perhaps this should be also interesting for you:
http://www.crazypc.com/products/930.html
but please reassure you know the right wiring for your case leds ,just take your motherboard's manual and check out them.

Cheers!
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