This general purpose power supply can e used for supply output voltages from 1 to 35V. The line transformer should be selected to give about 1.4 times the desired output voltage from the positive side of filter capacitor C1 to ground. Potentiometer R2 sets the output voltage to the desired value by adjusting the reference input.
Rsc is the current limit set resistor. Its value is calculated as:
Rsc = 0.65V/IL
For example, if the maximum current output is to be 1A, Rsc = 0.65/1 = 0.65Ω
The 1kΩ resistor, Rs, is a light-loaded resistor designed to improve the no-load stability of the supply.