Which AC adapter for Asus RT-N18U

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mwchang
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PostPosted: Wed Sep 22, 2021 16:35    Post subject: Reply with quote
kernel-panic69 wrote:
USB port shield is a known good ground on devices with a USB port.

Only if your country has a ground pin? And even when it does, the AC-DC adapter might not have a ground pin? Smile

I never know how you got a ground when the AC plug had only 2 pins (e.g. in USA)... Smile


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kernel-panic69
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PostPosted: Wed Sep 22, 2021 17:13    Post subject: Reply with quote
Ground = Vcc- = -12VDC ... I didn't know that I had to be that specific. Perhaps I should have said, "negative voltage bus" or something like that Razz Laughing
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jwh7
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PostPosted: Wed Sep 22, 2021 17:32    Post subject: Reply with quote
kernel-panic69 wrote:
USB port shield is a known good ground on devices with a USB port.
Oh ya, that too Wink I've been messing w/ this old effing WRT54GL too much the past couple days. :-/ Actually, the LAN ports' housing is likely grounded* too.

* In this case, referring to the reference in a circuit board...
mwchang wrote:
I never know how you got a ground when the AC plug had only 2 pins (e.g. in USA)... Smile
Easy, cuz if a ground is needed, polarized plugs are used, and electrical code requires the neutral (reference) line to be connected to ground (which literally goes to an earth ground - rod in the dirt) at the electrical box. Of course, this may not always be the case, esp. in older homes.

Devices that are 2-pin unpolarized means they use a transformer (like our power supplies) and have no exposed conductive surfaces (like e.g. a toaster). So to be fair, yes the voltage is with respect to the 'reference/negative' which is not really 'ground'. Way easier to say 'ground' though. Razz Now we've thoroughly beaten this dead horse. Smile

Project of the day: take a multimeter and test the voltage from a transformer 'negative' and stick the other lead into the dirt. Cool

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Last edited by jwh7 on Wed Sep 22, 2021 23:44; edited 1 time in total
kernel-panic69
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PostPosted: Wed Sep 22, 2021 18:25    Post subject: Reply with quote
The only cases I know of that are "different" are industrial / commercial / (even) residential 3-phase grounded or un-grounded distribution systems. I will tell ya that getting tickled by 480v 3-phase doesn't feel good. I still get random cramps in my right hand. That moment when you realize that a tag-out guide list is slightly incorrect EmbarassedShocked Of course, guess who had to review and fix all of these discrepancies, even though I had nothing to do with developing them Rolling Eyes I see your dead horse and raise you glue! Twisted Evil
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mwchang
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PostPosted: Thu Sep 23, 2021 4:15    Post subject: Re: Which AC adapter for Asus RT-N18U Reply with quote
wakatana wrote:
Can somebody please post photos of Asus RT-N18U AC adapter?

Here is a scan of the adapter's label.




asus.rt-n18u.power.adapter.jpg
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asus.rt-n18u.power.adapter
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 Viewed:  3484 Time(s)

asus.rt-n18u.power.adapter.jpg



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