Stereo input selector and 3 output splitter

Well the breaker or fuse would prevent that hopefully. The regulators and possibly the opamps will be dead. I suggested some hints to trigger the OP to see what is wrong.

That would be the house installation breaker/fuse as the PSU does not contain a fuse either (which it should have). Nothing sarcastic, just prevention of issues.
 
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I forgot to mention it above but yes the power input will be switched on primary side of transformer.

The side of the box where transformer and PSU are will be made of an aluminium plate, which will be connected to earth.
As for the rest of the box, I thought wood would be a safe enough isolation (puting aside fire hazard...).

Thanks for the Rod Elliot ressource, I'll definitely look into it. If I want to add a fuse on secondary side of tranformer for the PSU board, would 1A be too much ?

Concerning the error on the PSU, I guess you are refering to the fact that 0V input of PSU should be connected to transformer output and not on neutral power pin 🙄. The schematic is indeed very approximative concerning this part, and was there mostly to highlight the use of transformer.
 
You seem to connect 230V mains voltage via secondary windings to a Graetz bridge rectifier.

A metal box helps to keep unwanted signals out. Do the smart phone test and learn.

Calculating fuses value depends on the load current. You definitely need a fuse in the primary side to prevent switch off of a complete group of your home. And (please read this carefully) to protect the houses cabling when a fuse or breaker refuses to do its job.

Please consider the P88 + P05 and exact way of connecting.

I think I see a wireless thingie so give that one a separate 12V regulator en keep it as far as possible from audio circuits. An external antenna would be correct if quality is the goal.
 
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