[0-30 Vdc Stabilized Power Supply]

Only oner diode is needed.
When a diode is added in series with a regulated supply then the voltage is not regulated well anymore.

Ok. Now I´m lost. If you have time, can you please shortly describe how a diode will be negative for the regulation? More than 0.7V less voltage.

[0-30 Vdc Stabilized Power Supply]

He must be using liquid nitrogen and a huge fan to cool his single 2N3055 transistor.

Hehe, yes thats probably the case.   ;D
Well, I will go with three of them. Nothing negative with that isnt it?

I thought about protections. If I am  charging an led-acid battery with this PSU, do I need diodes on the outputs to ensure the PSU isnt going to break if switched of with battery connected or something like that?
What about diodes on both positive and negative output for protection against wrong polarity from battery? Will that affect the rest of the circuit?

[0-30 Vdc Stabilized Power Supply]

Buggy forum... When I posted my first post, 24 new pages appeared.
I placed an order on components today, can you please say if there is any changes in this projects design in the last 24 pages?

[0-30 Vdc Stabilized Power Supply]

Hi!

In this modified version (http://diyfan.blogspot.com.br/2012/02/adjustable-lab-power-supply.html) he seems to have some good points. But why has he stripped audioguys two 3055 to only one 3055 and no emitter resistor?