Re: power supply convert to 110V from 220V

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#477

From: Gary Tait
Date: Tue, 31 Dec 2002 15:17

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On Mon, 30 Dec 2002 19:26:14 -0500, "richard kimber"
<479kimber@comcast.net> wrote:

>Hi,
>
>I have a switching pc power supply off a 4 year old PC presently configured
>for 220 V AC input and I would like to alter it to run on 110V input.  The
>label says that it is a dual input type and that it may be switched
>accordingly.  However, there is no such switch and I'm wondering whether two
>free terminals on the PCB with a rectangle drawn around them (labelled
>110V - 220V) represent the location where two switch leads are intended to
>be soldered in place and when the switch is thrown to closed circuit thereby
>joining these two terminals - whether that is a voltage halver (it seems to
>connect to some resisters that might have that effect).  If so, then I plan
>to solder in a bridge.
>
>
>Any ideas?
>Thanks - Rich
>

Make sure they go somewhere. Traditionally, the main capacitors are in
series, and in 110V mode the center point of the two capacitors is
connected to AC neutral (one of the inputs to the bridge rectifier)

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From: Gary Tait <taitg@hurontel.on.ca>
Newsgroups: alt.comp.hardware.homebuilt,sci.engr.electrical,aus.computers
Subject: Re: power supply convert to 110V from 220V
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