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Evaluation of a DIY power supply
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Dhanushka:
http://www.electronics-lab.com/project/0-30-vdc-stabilized-power-supply-with-current-control-0-002-3-a/

This is a adjustable power supply. What will be the performance of this as your experience according to information given?   

Thanks
David Hess:
It can be made to work but that common design has some pitfalls which others can comment on.  There are suggestions for improvements somewhere.

It is awfully complicated for its performance and features.
Kleinstein:
That type of circuit is discussed over an over again. It is an old design, AFAIK based on an old (1970s) article from an US electronics magazine. It is also available as a cheap kit from banggood or similar sites.

In principle the circuit is not that bad or overly complicated. However as shown it has some serious flaws: The TL081 is not good for a 44 V supply - the original circuit used a more suitable 741. With the TL081 the maximum AC voltage should be around 20 V, better 18 V. The 2N3055 is not really suitable to dissipate up to 100 W (some 33 V and 3 A). So the maximum current should be reduced - more like 1.5-2 A. Even with 24 AC the circuit can not reliable deliver 30 V, not even under no load conditions - more like 24 V max, less with a lower voltage transformer.
H713:
It's been a while since I last had to troubleshoot an NJE LVC series power supply (I scrapped my pair about a year ago after I got really tired of servicing them), but I seem to remember them using a very similar circuit, though a bit simplified. They were decent supplies, quiet (when working properly) and the load regulation was pretty good. CCS was pretty decent as well.
I concur about the 2N3055, that's pushing it exceedingly hard, as has been mentioned the TL081 is a poor choice (+/- 18V maximum, so a 36v supply would be the max you'd want with one), and as mentioned it probably could be simplified a bit.
xavier60:
The design I used for a recent project evolved from a dysfunctional internet finding,
https://www.eevblog.com/forum/projects/linear-lab-power-supply/msg2388873/#msg2388873
It works very well now, used daily with with no sign of trouble.
It is not obvious from the schematic that it has fast current limiting which many designs don't have.
I can share my PCB layout also.

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