The top drawing is the main schematic and below it is the wiring diagram for the course (25k) and fine (5k) voltage adjustment potentiometers.
LM2575- ADJ Switching Regulator Parts List
| C1 - 100uf Electrolytic Capacitor
C2 - 1000uf Electrolytic Capacitor
C3 - .1uf Ceramic Capacitor
C4 - .1uf Ceramic Capacitor
D1 - 11DQ06 Scottky Diode 60 volt 1.1A
D2 - 1N4002 Diode General Purpose 1A
F1 - Fuse 1A
IC - Regulator - 2575 - ADJ
J1 - Jumper
L1 - TE2017 330uH, 0.9A, 50KHZ
P1 - 25k Potentiometer
P2 - 5k Potentiometer
R1 - 1K Resistor
The capacitors should be rated at 50 volts or higher. On my board I left C3 empty and used a 2uf tantalum capacitor for C4 since I had some on hand.
The J1 Jumper shown below can be removed to access the regulator's on/off pin #5.