Switches

[Drum Thumper]

Two quick questions regarding on/off and reset switches: SPST and SPNO respectively? Or DPDT DPNO?

TIA,

Drumthumper

[mellojoe]

**Bump**

Because I want to know, too.

[Redundant]

I'm not really sure what you are asking, but here is the Wiki article:

"Switches" (http://en.wikipedia.org/wiki/Electrical_switch#Contact_arrangements)

[Drum Thumper]

I'm not really sure what you are asking, but here is the Wiki article:

"Switches" (http://en.wikipedia.org/wiki/Electrical_switch#Contact_arrangements)

Alright, see what happens when I dig around in the cobwebs in my mind?

Obviously power switches are SPST and the reset switches are 'Momentary On/Off'.

+rep for you!
:banana:

[Crimson13]

The power and reset buttons for computers are momentary.

[dfigravity]

damn...taking me back to electronic principles...*shudder*

[xmastree]

Two quick questions regarding on/off and reset switches: SPST and SPNO respectively? Or DPDT DPNO?
Right...

SPST, Single Pole, Single Throw. That's your basic on/off switch, but not used in computers.

SPNO, Single Pole, Normally Open. That's used for the reset, and also for the power in ATX systems (like any recent system).

Older AT systems used DPST (Double Pole, Single Throw) for the power, which actually turned off the AC power to the PSU, as opposed to the ATX type which just tells the motherboard to shut down the PSU.

Does that help?

[blk03MitsuES]

so to make things clear........atleast for me...

http://www.mcmaster.com/catalog/113/gfx/small/d1cga6as.gif


Low-Voltage Metal Push-Button Switches
Operate doorbells, buzzers, or other low-voltage circuits with the push of a button. Switches turn one circuit from "off" to "on" (SPST-NO) and spring back (momentary). Buttons are plastic and bodies are metal, unless noted. All have two screw terminals, unless noted.
Styles A-C are panel mount. Style A snaps into a panel; Styles B and C have a hex nut for mounting. Styles D-F are surface mount. Styles D and F include mounting hardware; Style E has a 1/2" trade size NPT threaded female hub on the bottom and is fitted with two 1/4" dia. side mounting lugs.

http://www.mcmaster.com/catalog/113/gfx/large/69755kp5l.gif


so these would be the SPNO, right?

[Bucko]

They would be as it says in the quote, SPST-NO (Single Pole, Single Throw, Normally Open) momentary switch.

[blk03MitsuES]

They would be as it says in the quote, SPST-NO (Single Pole, Single Throw, Normally Open) momentary switch.

so that means "yes" or "no"?:?

[.Maleficus.]

I guess he means no, but that is just because you wrote it wrong. If you are looking to replace your power switch and want to know if that will work, then yes, it will work.

[blk03MitsuES]

ok thanks for the clarification Maleficus........... i see what i typed wrong, so SPST-NO isnt the same as SPNO