No probs
I will have a look for a suitable PSU, but I am quite busy at the moment. A number of members are experienced in PSUs, perhaps they could recommend some suitable designs as well.
But I can recommend a complete lab PSU that will do your job for around £47UK, including shipping (the transformer for a DIY PSU would cost more than that). The lab PSU provides 0V to 30V and 0A to 10A, with digital readouts for both voltage and current. There are controls for coarse and fine voltage output and the same for current. I have three of these and use them for electronics, battery charging, you name it.
https://www.ebay.co.uk/p/Adjustable-DC-Power-Supply-30v-10a-Variable-Precision-Digital-Lab-PSU-Clip-Cable/23025566378
You can probably get this generic lab PSU delivered to Romania.
From the pictures (if you look through the case aeration slots it looks empty inside) I guess it is a switching PSU.
The linear ones are better as they can be easily improved by replacing the electrolytic caps (they are low quality and too low voltage) and adding a proper TO3 heatsink (as minimal cure).
UPDATE #1 2018_12_14 not1xor1 is correct, my PSUs are in fact switching- I just had the covers off
[/quote]
It is a linear PSU, with a very low level noise output of 3mV, why do any guessing.
Although these PSUs work well as is, there are a few things that you can do to enhance them.
[1] Check the quality of solder joints and general workmanship (my three are fine, but the quality can vary according to some reviewers)
(2) Fit an output rail on/off switch
(3) Fit better quality potentiometers, say ten turn for the fine controls.
Incidentally these power supplies, at the price, can just be bought for the parts.
The transformer itself would cost you over £50, and then there is the chassis, voltage and current meters,
2N3055s, heatsinks, fan, knobs, caps, resistors, diodes ...
I am thinking of converting one into a precision current source.