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power conversion US to UK [110v to 240v]
power conversion US to UK [110v to 240v]
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Old 11th February 2007, 03:31 PM   #1
make is offline make  United Kingdom
diyAudio Member
Join Date: Feb 2007
Location: London
Default power conversion US to UK [110v to 240v]

Hello all,

I was recommended to pose this question here as I was informed that this place is full of smart people! Im fairly new to DIY projects and it looks like Ill be using a lot of the good advice thats been posted here.

I recently purchased an Orban 672A paragraphic EQ and it is configured for 110VAC/USA power. It has the potential to be converted to 240VAC/UK but I wanted to check that I am right in decyphering the instructions.

Inside the unit, on top of the transformer, is a card that has printed on it:

"Mains 1 & 4

For 117VAC
Strap 1&2, 3&4

For 230VAC
Strap 2&3 only"

The transformer has 4 pins, of which 1 is jumpered with 2 and pins 3 with 4. [see images]

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Do I have this correct that I have to remove the current jumper settings and then solder a jumper between pins 2& 3?

Im fairly confident that I have this correct but there's nothing better than a 2nd, 3rd and 4th opinion and I would hate to possibly blow up this lovely new [to me] EQ.

Any help and advice greatly appreciated.
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Old 11th February 2007, 04:02 PM   #2
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
two points to consider.
First, you have interpreted the instructions correctly.
Secondly, build yourself a mains light bulb tester, that allows you to safely plug in and switch on a badly mis-wired project without it blowing up in your face.
Take care in your new hobby.
regards Andrew T.
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Old 12th February 2007, 08:53 AM   #3
ifrythings is offline ifrythings  Canada
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Join Date: Oct 2005
Pin 1 has Black, pin 2 and 3 will have a jumper to it and pin 4 will have white. The jumper between 1 & 2, 3 & 4 must be removed(as you already know).

Pin 1 and 4 are one winding, and pin 2 and 3 are another, in 110V opperation you have them parellelled, in 220V they are series together.

Other than that, do what AndrewT said first before hooking it up to the mains.
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