0-30v 0-5a power supplies in the market have abundantly set an intermediate tahtakale at 0-15v and 1.5v, 3.6v, 4.8v, 6v. I’ve seen the 7.2v-stage two-in-one power supply in a mobile phone repair shop.
If you have this power supply and malfunctions, the circuit diagram will be useful. BEB DC POWER SUPPLY PS1502D on the market is usually sold as a different brand (TT Technic, Cyber etc …) but the model number is the same
Schematic Circuit diagram;