I think I see the problem now. You are in the UK and your AC supply is 230 VAC. Pay attention to the colours on the transformer and the dots shown in the diagram.

On the primary side, you need to connect Grey and Violet.
230 VAC is applied to Blue and Brown.

Similarly, on the secondary side, connect Yellow to Black.

 

How do I wire this as it looks like I've got it wrong

To work with the 230 volts mains system, the primary windings need to be connected in series, which the clipped image does not show the colors of the wires. But post #21 does show them. So the "115V" of the top must tie to the "0V" of the bottom winding. (Now I see the image in post #21: Connect the 230 volt mains to the blue and the brown wires, Tie the grey and violet together and insulate that connection adequately for the mains voltage.
For the secondary winding, tie the yellow and black together to serve as the center connection in the circuit you posted.

 

May be showing some of my own ignorance here, but isn't there a 90˚ shift in a transformer? Wouldn't the secondary be 90˚ out of phase? I'll let the expert pick this apart.

 

but isn't there a 90˚ shift in a transformer?

No.
Transformers generate no significant phase-shift from primary to secondary.
Where did you get that idea?

 

To work with the 230 volts mains system, the primary windings need to be connected in series, which the clipped image does not show the colors of the wires. But post #21 does show them. So the "115V" of the top must tie to the "0V" of the bottom winding. (Now I see the image in post #21: Connect the 230 volt mains to the blue and the brown wires, Tie the grey and violet together and insulate that connection adequately for the mains voltage.
For the secondary winding, tie the yellow and black together to serve as the center connection in the circuit you posted.

Originally I had twisted the grey/violet wires together and connected them to the blue neutral and the brown/blue twisted and connected to the brown live wire. As I had 2 boards to run I connected them thus 1 is red and black and board 2 orange and yellow.

 

Originally I had twisted the grey/violet wires together and connected them to the blue neutral and the brown/blue twisted and connected to the brown live wire. As I had 2 boards to run I connected them thus 1 is red and black and board 2 orange and yellow.

Good lord! No wonder the fuse blew.
That appears to be a direct short.

 

Originally I had twisted the grey/violet wires together and connected them to the blue neutral and the brown/blue twisted and connected to the brown live wire. As I had 2 boards to run I connected them thus 1 is red and black and board 2 orange and yellow.

Certainly that connection scheme will pop a fuse every time! In addition, connecting only two leads to each supply circuit will, at best, provide either the positive, OR the negative output, in a manner that will work. There is a large amount of good published information about transformer based dual input voltage power supplies available.
Look at the circuits in the "power" section of "schematicsforfree" website. I advise ignoring what is shown on the "cartoon channel" because there is a fair amount of incorrect stuff there.
There may also be some correct information, in a few instances.

 

No.
Transformers generate no significant phase-shift from primary to secondary.
Where did you get that idea?

Back when I was 21 I heard a friend talking about phase shift in inductors such as a transformer. I've held on to that thinking all these years. It's been a very long time since I was 21. Must be almost 150 years ago (facetious comment). Perhaps it's voltage to current being 90˚ shifted. I recall seeing a video that showed voltage rise and fall (sine wave) with the current being 90˚ out of phase. Perhaps that's where I got that idea.

 

At 4:15, this seems to be saying what I was thinking.

 

When a transformer winding is part of a resonant circuit there can be some phase shifting. AND you can often find 180 degrees of phase difference relative to the center tap of a transformer. but not 90 degrees, although the classic discussions of FM detectors (discriminator circuits) can certainly lead to serious confusion.

 

The TS transformer (TR1) is a 230V to 15-0-15 volt transformer. (see post #1)
In post #13 we see this image:
View attachment 356413
The TS thought by connecting one leg of the primary to one leg of the secondary, in particular one of the two NON-Center Tap leads would solve some sort of problem.

The complaint is the fuse keeps blowing. In post #14 sghioto shows the fuse before the transformer. In my stereo amp I had a 7 amp fuse before the transformer blowing. When I disconnected the bridge rectifier (BR) the fuse did not blow. Turned out I had a shorted diode in the bridge. The main difference was that my secondary was not center tapped. Still, a shorted BR could be the reason for the blown fuse. If I'm late making this suggestion I'll make it now - disconnect the BR and replace the fuse. Power it up. If the fuse blows then you have a bad transformer. If not then it's either the BR or something beyond the BR that is drawing heavy current.

Has anyone mentioned this before? I can't imagine it hasn't been said yet. I'll review all the posts and edit if necessary.

 

Well the rectifier test !! blew the fuse.

Are you saying the fuse blew with just the transformer connected?
View attachment 356285

Yes but the switch arches / sparked cause of a crimped connector I swapped that out but was knackered by the time I ha finished so Tomorrow. we shall see.

Based on this recap - either the transformer is mis-wired as MrChips suggested or the transformer is bad.

 

There are several ways to wrongly connect a transformer with split windings. AND several ways to incorrectly connect it to a bridge rectifier.

 

The (Kicad)? DWG in post #1 has two different GND's with the same identifier one GND the other should be GND2 for e.g.
I do believe?

 

The TS transformer (TR1) is a 230V to 15-0-15 volt transformer. (see post #1)
In post #13 we see this image:
View attachment 356413
The TS thought by connecting one leg of the primary to one leg of the secondary, in particular one of the two NON-Center Tap leads would solve some sort of problem.

The complaint is the fuse keeps blowing. In post #14 sghioto shows the fuse before the transformer. In my stereo amp I had a 7 amp fuse before the transformer blowing. When I disconnected the bridge rectifier (BR) the fuse did not blow. Turned out I had a shorted diode in the bridge. The main difference was that my secondary was not center tapped. Still, a shorted BR could be the reason for the blown fuse. If I'm late making this suggestion I'll make it now - disconnect the BR and replace the fuse. Power it up. If the fuse blows then you have a bad transformer. If not then it's either the BR or something beyond the BR that is drawing heavy current.

Has anyone mentioned this before? I can't imagine it hasn't been said yet. I'll review all the posts and edit if necessary.

I questioned that link in post #15, though it may not have been clear what I was referring to.

 

Based on this recap - either the transformer is mis-wired as MrChips suggested or the transformer is bad.

Mis wired.