Which zener diode and transistor to choose?

Question

Electronics

Initial data
Current, operation of the amplifier, I(in.av.)=0.00009 A;
Supply voltage U= 220V;
Operating temperature range from 233 to 323 K;
Parameters of the output relay KL:
Rated voltage of the coil, U(nom)=48 V;
Coil resistance, R(nom)=1240 Ohm;
Operation stability range from (0.8..1.05)U(nom).
The maximum stabilizer current is 0.038 A.
The stabilization voltage of the parametric stabilizer is in the range from 38.4 to 50.4 V.

Answer 1

Good job. But asshole.
And the diagram too.
Where is the "supply voltage U" applied? (guesses do not count).
Why are R1 and R2 connected in parallel (error?)
If the terminals of the first transistor are Ukenas, what is the point of it (what can it control)?
What is the function of the circuit as a whole and what closes / opens the relay?
Where did you get this lunatic?