You can select the output voltage range by 0-30V or 0-40V of 0-60V. The component's value will be different depends the output range you choose.
| Vout | Iout | R1 | R4, R5 | R9 | Tr1 | C1/C5 | IC1 | Tr2 | Tr3 |
| 0-30V | 1.3A | 0.47Ohm | 33k | 2k7 | 24V/2A | 40V | 723 | BD242 | 2N3035 |
| 0-40V | 0.8A | 0.82Ohm | 47k | 5k6 | 33V/1.5A | 63V | L146 | BD242A | 2N3035 |
| 0-60V | 0.6A | 1.2Ohm | 68k | 19k | 48V/1A | 80V | L146 | BD242B | 2N3442 |
Please check the output current since higher voltage output will decrease the current output.