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Can anyone tell me how a PC power switch works?

post #1 of 10
Thread Starter 
Im no electrical engineer or electrician for that matter. How exactly does a pc power switch work, as in the one thats normally on the front/top? Im interested in modding it and would like to know how it works, so i can replace it with something better.
post #2 of 10
You see how there are two wires connected to it?

When you push the switch, the circut is closed and the current can flow from one wire (+) to the other wire (-). When you release the switch, the circuit is opened, and no more electricity flows.


Edit: Unless you are using a really old AT computer, then the circuit has to stay closed to keep the computer on.
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post #3 of 10
The power switch basically completes a circuit on the motherboard, when pushed turning on the pc.
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post #4 of 10
Thread Starter 
i use an asus motherboard, and where the switch connects to the mobo it says power for one wire and ground for the other. This doesnt sound like a +/- connection to me. Or am i mistaken?
post #5 of 10
Quote:
Originally Posted by Pyranite View Post
i use an asus motherboard, and where the switch connects to the mobo it says power for one wire and ground for the other. This doesnt sound like a +/- connection to me. Or am i mistaken?
Its a DC circuit, Same thing.
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post #6 of 10
Thread Starter 
Oh sweet! I did electronics in high school and all we did was D/C stuff! Thanks all REP+ (dw, im not going to go electrocute myself)
post #7 of 10
Quote:
Originally Posted by Pyranite View Post
(dw, im not going to go electrocute myself)
Even if you did, the most you'd feel is a little tingle
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post #8 of 10
The tec here uses a screw driver to compleat the cercut. It only needs contsct tween the 2 pins for a moment. I bought a cheep switch here to mod into the back for about 2$.
 
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post #9 of 10
Your PSU outputs +5 on a specific pin (+5VSB) when ever it's plugged in and turned on.

This voltage is used to power your motherboards power control circuitry so that i can turn on when the BIOS tells it to, or when you press the button.

The power button is nothing more then a momentary SPST push button switch.

When you press it, your motherboard's power control circuitry connects the PS_ON lead to ground, then the PSU turns on fully up and provides power to all pins. Then it sends a Ready signal to the motherboard once it is fully powered up, so that the system only starts after the PSU is ready.

You can replace/mod your PSU switch with anything that will provide a momentary connections of two contacts.

Lamptron and Bulgin both make lighted vandal proof push buttons that just look bad ass...





tons of designs out there...



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post #10 of 10
yep, just a momentary SPST (single pole, single throw) switch

I just bought two spst momentary toggles (OFF-(ON)) from mcmaster-carr for the case mod project I am doing for my daughter. I am going to wire the new switches into the Power and Reset button circuits. Basically the new switches act as a circuit breaker so when the compuer is on my daughter cant do anything by pressing reset or power. In order for them to function you need to hold ON the secondary switch for that circuit, which are being installed on the back of the case (my daughter is 2). When my wife turns on the computer, she'll reach over and hold up the power toggle, then press the fron case switch like normal, then release both - same goes for reset if need be
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