power supply convert to 110V from 220V

Thread View: alt.comp.hardware.homebuilt

3 messages

[T] Back to Threads [V] Tree View [G] Group Articles

3 total messages Started by richard kimber Tue, 31 Dec 2002 00:26

#480

Author: richard kimber
Date: Tue, 31 Dec 2002 00:26

16 lines
2316 bytes

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

Re: power supply convert to 110V from 220V

#481

Author: Ralph Wade Phillips
Date: Tue, 31 Dec 2002 00:55

29 lines
2333 bytes

Howdy!

"richard kimber" <479kimber@comcast.net> wrote in message
news:oEudnc54jsu4eY2jXTWcqA@comcast.com...
> 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.

        It's not a voltage HALFER - it bypasses 1/2 of the voltage DOUBLER
when installed.

        Why not just pick up a new power supply with the switch?  No telling
what else got changed if they left out such a small item ...

        RwP

Re: power supply convert to 110V from 220V

#482

Author: Rod Speed
Date: Tue, 31 Dec 2002 03:12

30 lines
2415 bytes

richard kimber <479kimber@comcast.net> wrote in message
news:oEudnc54jsu4eY2jXTWcqA@comcast.com...

> 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

Yes.

> and when the switch is thrown to closed
> circuit thereby joining these two terminals

Probably. Have a look at
http://www.technick.net/public/code/cp_dpage.php?aiocp_dp=cir_ps_at_001&PHPSESSID=f9fba1bc8d09aecd162dcd3c5c3f0a8e
and see how its usually done.

> - whether that is a voltage halver (it seems to connect
> to some resisters that might have that effect).

Technically it doesnt work like that, but the detail doesnt really matter much.

> If so, then I plan to solder in a bridge.

That'll work fine. Just check that the circuit is basically the same in that
area. I havent noticed any that do that 110/220 switching any other way.

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads