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Author Topic: RESOLVED What is "VSB" on a power supply?  (Read 288 times)
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JimboZA
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« on: January 06, 2013, 09:41:41 am »
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Hi gang,

The pic shows the label on a desktop pc power supply... I understand the DC outputs like 3.3, 5 (circled red) and 12V, but I've never noticed the +5VSB (circled purple) before.

Please can someone enlighten me as to what that is?

TIA,

Jim
« Last Edit: January 07, 2013, 12:04:42 pm by JimboZA » Logged
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johnwasser
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« Reply #1 on: January 06, 2013, 10:13:58 am »
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I believe the "+5V" part means the same as it does elsewhere.  The "SB" part probably stands for "Stand-By" which would mean a 5V supply that is on even when the rest of the power supply is off.  It's used to maintain memory or power the power switch.
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JimboZA
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« Reply #2 on: January 06, 2013, 10:17:31 am »
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Yep I got the +5V part too John  smiley

But thanks, Stand By makes sense.

Quote from: johnwasser on January 06, 2013, 10:13:58 am
power the power switch.

Gotta love that idea.... sorry, can't switch the power on cos there's no power to power the switch.
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MarkT
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« Reply #3 on: January 06, 2013, 04:38:18 pm »
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Well its used for wake-on-LAN etc, not just the power switch.  Some machines have permanently powered USB sockets
too IIRC.
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JimboZA
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« Reply #4 on: January 07, 2013, 12:04:06 pm »
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Confirmed from various Instructables like this one that the purple "SB" is indeed StandBy.
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