[sdiy] Siel OR400 Transformer needed

Steve Lenham steve at bendentech.co.uk
Fri Jul 26 12:16:04 CEST 2013

On 26/07/2013 10:39, M Maeghan Skala wrote:

> So, I"m looking for a 30VA transformer, center tapped … which has two
> secondaries rated at 15VAC.
> Please correct me if I am wrong.

That's about right.

To be absolutely clear, a transformer will only be described as 
centre-tapped if it has three secondary pins (two ends and one centre 
tap). It may also be described as, say, 15-0-15 or 30VCT.

Here in Europe at least, pretty much all transformers now seem to be 
made with two separate secondaries, i.e. four secondary pins. These are 
not strictly centre-tapped. They can be wired centre-tapped as I 
described, but can also be used in other configurations which is why the 
modern parts are made that way. They may be described as 2 x 0-15 or 2 x 

BTW, it is OK to use a higher VA-rated transformer if it is easier to 
source and will physically fit.


Steve L.

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