[0-30V Stabilized Power Supply]

A 120VA transformer is slightly too small. Then when the project is supplying 3A continuously the transformer will be slightly warmer than its max allowed temperature.
Inside a box it might get too hot.

Many thanks.  As I do not anticipate using the supply at 3A a lot, nor for long periods I think I will go for this option and just be sensible about suitable cooling.

You do a great job on here, I am sure that many other appreciate your advice as well.

All the best

[0-30V Stabilized Power Supply]

Hi, just trying to source a transformer for this.

RS do a 2x15V 4A essentials toroidal transformer.  I realise that this only rates at 120VA rather than the 126VA recommended.  Is it possible to use this? If so what effect will the missing .2A have on the output?