Faulty schematic.

[bastouw]

Hello, I am reading the The Art Of Electronics 2e Edition.

The topic VOLTAGE REGULATORS AND POWER CIRCUITS have examples of bad cirquits.
And 2 of them i have troubble reasoning whet the fault is.
Can someone help me?  Here are the attached schematics:

[grumpydoc]

I'm wondering how the first one starts given that the op amp power supply is taken after the pass element.

Not sure about the second for a moment....

Ah, yes - once the current limit transistor has turned on it will feed lots of base current to the pass transistor, probably not what was intended.

I think those are the faults - anyone agree (or disagree for that matter).

[Andy Watson]

Agreed. The first pass transistor in the first circuit will require driving with a base voltage 0.6-0.7 above the supply rail to the op-amp. It's not going to happen, even with a rail-to-rail op-amp!