Simple Bench Power Supply that Anyone Field Can Build!

This bench power supply functions by taking an unregulated or higher-voltage DC input from a standard notebook computer power brick, which typically outputs between 15V and 19V, and stepping it down to precise, user-adjustable voltage levels suitable for electronics prototyping. The system integrates dual step-down DC-to-DC buck converter modules, specifically featuring an LM2596 converter and a DROK 180081 Numerical Control Step Down Voltage Regulator Stabilizer. Buck converters operate via high-frequency pulse-width modulation (PWM) combined with inductors and capacitors to efficiently drop an incoming DC voltage to a lower target voltage with minimal thermal waste compared to linear regulators. The DROK module provides digital numerical control, allowing the user to precisely set output voltages and utilize preset memory features, which is especially useful when switching between common logic levels like 5V and 3.3V. Housed inside a protective plastic project chassis, the internal circuitry routes power from the matching DC power jack through the regulators to a set of red, black, and yellow binding posts on the front panel. By separating the conversion stages or configuring the modules, the supply can deliver both fixed and variable outputs, while the pre-certified external power brick safely isolates the user from high-voltage AC mains during operation.