Brand new and high quality Before using the adjustable constant voltage and constant current power supply, first set the constant current protection value, then set the output voltage, and then start working. DIY kit for adjustable power supply motherboard, suitable for accessories with idle transformers or for repurposing old power supplies, using their chassis, transformers, meter heads, and other accessories. This kit includes all components and circuit diagrams, but transformers, casings, and voltage/current meters are not included. This power supply uses a previous linear adjustable design. The output protection circuit is not perfect and is limited to amateur learning and experimental applications. Do not use it to power valuable electronic equipment! This product is provided as a kit and requires self-assembly, including electronic component soldering and circuit debugging, which are complex tasks requiring experience. Material: Plastic & Electronics Size: Approx. 10x10CM/3.93x3.93 inches