[0-30 Vdc Stabilized Power Supply]

What do you think about NE5534AN? It's the most similar to MC34071 that I could find in my country!
I'm thinking about building new circuit.  ;D

[0-30 Vdc Stabilized Power Supply]

One more time, just to check.
Is this schematic OK?

Do I need some stronger resistors(like in new version)?

I have some old 20,000uF 35VDC capacitor,
should I test my luck with it or buy 10,000uF 50V?
(those are not so cheep is Serbia  :-\)

[0-30 Vdc Stabilized Power Supply]

Like the original project, the values for R4 and R10 are wrong and R10 connects to the wrong voltage.
Also like the original project, the main filter capacitors are much too small.
Each 2N3055 output transistor needs a series emitter resistor for matching.
The value of R14 will need to be changed to match your reduced supply voltage.

Can you suggest values for those components (main filter capacitors and R14)?

Is this mod OK? Do you think it will be good enough for 20V 2A?

[0-30 Vdc Stabilized Power Supply]

I decide to build this project. Only bad thing is, that I saw this topic after buying all parts.
After gr8 disappointment, I'll try to build it as good as I can. I draw something between old and new schematic.
Please tell me what you think and how can I make it better without changing OPamp.
I need about 20V DC output, and around 2,5 Amps for my testings.