Hi,
Thank you all for your help. Sorry for the delayed reply.
@efron
I haven't started to build my supply yet. I am still researching and trying to learn more about this and other topics

. For the moment I built a standard LM7805 based 5V supply to power my microcontroller projects

.
I came up with this specs mainly for the following reasons:
- I thought that maybe in the future I will need the 24V and the 2A for different projects (maybe to drive some stepper motors, or something like that). So having the full 1.2-24V range seemed a good idea.
- because of the high power dissipation involved I thought that this may be a good way of learning new things. I set this goal hoping that in the process I will learn more about the design of power supplies.
But I am always opened to new ideas, suggestions, comments or any help you can give

. Anything that can help me in my learning process is more than welcomed

.
Also thank you for sharing your design with me.
@Hero999
I don't fully understand ( yet

) the circuit you posted (I am still learning about transistors and zener diodes) so if you could explain it in more details I would really appreciate it. Especially the zener part.
I also have a question. What is the role of the R2 resistor?
Thank you
