Hi David,
Thanks for the reply. About your simplified schematic, you're right R7 voltage is always 1.25V however after some thought I realized that the voltage copied by the op amp is not this 1.25V but the output voltage minus 1.25V, thus allowing the voltage to go to zero. Great! now I can delete the voltage regulator from the second transformer in my schematic.
As for your other comments, from
1. You're right it's unregulated, I don't know a good and efficient way to get 1V regulated from 34V input, I'd love suggestions.
2. If I understood correctly, and you meant to simply delete the connection from the bottom of the pot VR1 to ground, that wouldn't work because the pin 5 would see the voltage from the voltage divider R1-R10 (0-1V) , and I wouldn't be able to regulate the current with VR1.
The current regulation part works and is stable but I get coarse instead fine tunning (I'm not happy about it).
Also the voltage/current meter that I have works with 3-30 input voltage, but I get 34V from B1, I fixed it with a transistor as in shown in the schematic, but I'm not sure how good of a solution it is.