Power supply unit from 230VAC to 12V, 5V, 3.3V DC
The biggest problem might be the power dissipation in the 12 V regulator. It can supply 1 amp (plus whatever load is on the other supplies) and, when doing so, there will be 12 V DC out and about 15.5 DC volts in. That's an internal dissipation of 3.5 watts. Added to this is that the 7812 regulator that supplies the 1+ A (if indeed it is a 7812) has a drop-out-voltage of typically 2 V and this means that the AC input voltage only has to drop to about 78% and the regulator is no longer regulating.

This is usually avoided using a 15 V AC secondary but then you get even bigger heat dissipation problems.