Path: utzoo!attcan!uunet!jarthur!usc!cs.utexas.edu!rutgers!bellcore-2!envy!karn
From: karn@envy.bellcore.com (Phil R. Karn)
Newsgroups: sci.electronics
Subject: Re: question about computer power supply
Keywords: computer power supply
Message-ID: <1990Jul31.215231.25244@bellcore-2.bellcore.com>
Date: 31 Jul 90 21:52:31 GMT
References: <4924@uafhp.uark.edu>
Sender: usenet@bellcore-2.bellcore.com (Poster of News)
Reply-To: karn@thumper.bellcore.com
Organization: Packet Communications Research Group (Bellcore)
Lines: 12


In article <4924@uafhp.uark.edu>, hbj@uafhcx.uucp (Bernard Johnson) writes:
> I have been told that the +12V line will not
> be +12V until a load is connected to the supply.

Some multi-voltage switching supplies regulate only the 5V output. If there
is no 5V load, the switcher will cut back to a very low duty cycle, and this
may not be enough to sustain the 12V output (especially if there is a load
there). Try putting a load on the 5V output and see if that affects the
12V output.

Phil