transistor voltage stabilizing circuit

It is a practical transistor voltage stabilizing circuit . In the figure, Rl, RP, and R2 form an error sampling circuit, VT3
and Rc form an error amplifier circuit, VD is a reference voltage source composed of a silicon voltage regulator tube, R3 is the current limiting
resistor , and VTl and VTz are composite adjustments. tube, used as power output.
    In the error sampling circuit, RP is the output voltage adjustment potentiometer . Adjust the potentiometer RP to change
the position , and change the sampling amplification by changing the ratio of the voltage dividing resistors Ri+Ri and R2+Rz. When the base voltage of tube VT3 is
V, the output voltage can be adjusted.