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Electricity Question (new questions, LEDs 'n stuff)

post #1 of 13
Thread Starter 
OK so I found this cool website called Parts Express. They sell switches there for cheap

So I was looking at their switches... Most of them are rated for alternating current (VAC). I was wondering if there was a way of converting that into VDC for fans, as I would need 12V for a few of them.

I also need to know what type of switch I would need for power and reset. I know I want a momentary switch, as I don't want to flip a toggle back and forth to turn on my computer. What type of current/voltage would they need to support?

Also, NO, NC, SPST, and DPDT. Couldn't figure out what the differences are between these ones... NO and NC are momentary I believe, and the other two are for toggles.

New question: For front panel LEDs (i.e. power and HDD activity), what type of current and voltage do the two LED circuits carry? I want to figure out if I need to buy resistors to go with some LEDs or if the motherboard only gives out a few mA of current.
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post #2 of 13
you'll need push button switches for power and reset. The ones that return to their original position after release.
pretty sure this is one
http://www.partsexpress.com/pe/pshow...8&ctab=15#Tabs
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post #3 of 13
It just has to be a momentary switch of some sort.

The One they have is a little overkill. It would work for your needs tho. If I were you, I wouldn't just order one at a time from a supplier like this. You might experience a "bad batch" & be highly annoyed when you go to connect it. Order 2 or more just in case.

By the way, these work great if you have a mobo that has jumpers that you have to move around occasionally. Try this:

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post #4 of 13
Thread Starter 
Quote:
Originally Posted by MasterShake View Post
you'll need push button switches for power and reset. The ones that return to their original position after release.
pretty sure this is one
http://www.partsexpress.com/pe/pshow...8&ctab=15#Tabs
Yep I know I need a momentary switch for power and reset. I wanted to know the difference between the NC and NO switches though, thats the confusing part

Quote:
Originally Posted by Indignity View Post
It just has to be a momentary switch of some sort.

The One they have is a little overkill. It would work for your needs tho. If I were you, I wouldn't just order one at a time from a supplier like this. You might experience a "bad batch" & be highly annoyed when you go to connect it. Order 2 or more just in case.

By the way, these work great if you have a mobo that has jumpers that you have to move around occasionally. Try this:

I don't need it for CMOS reset, I've got a little button under my SATA ports
I do need it for power, reset, and some fans/lighting. This is for my case project in my sig.

So do I want NC or NO for power and reset?
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post #5 of 13
As Indignity stated, you will want This type of switch

"Momentary"

Push for continuity - release to open circuit

...looks like either one will do? (I can't distinguish what the difference between NO and NC is)
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post #6 of 13
NO = Normally Open
NC = Normally Closed

So:
A NO, momentary switch will make the circuit (ie. allow current flow) while pressed.
A NC, momentary switch will break the circuit (ie. stop current flow) while pressed.

Here's a picture of the various typical of typical switches.
Note that Momentary switches are only Single Throw

There are many, many other combinations, but these are the most common.
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post #7 of 13
billbartuska +

Thanks for that.

-lol @ me. I never associated the acronym with the condition of the switch...
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post #8 of 13
Thread Starter 
Cool thanks! +

So I want SPDT, and NO, thanks!
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post #9 of 13
Thread Starter 
bump for new question:
For front panel LEDs (i.e. power and HDD activity), what type of current and voltage do the two LED circuits carry? I want to figure out if I need to buy resistors to go with some LEDs or if the motherboard only gives out a few mA of current.
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post #10 of 13
The LED's are usually around 3.3v 20 mA and since there are no resistors used to power the LED's from the MoBo the MoBo would put out 3.3 V Here is a good site about LED's. http://led.linear1.org/led.wiz
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