WZ-4 Adjustable Regulated Power Supply Board Kit - Based On LM317 & LM337 Voltage Regulators (Jooloyo Brand)

Electronics hobbyists, this is a neat little board for your bench. It's the WZ-4 design, a dual-polarity adjustable power supply built around the classic LM317 (positive voltage) and LM337 (negative voltage) regulators. You provide a transformer input, and this board gives you clean, adjustable positive AND negative DC outputs – perfect for powering op-amp circuits, audio projects, or testing. It comes as a pre-assembled red PCB from Jooloyo. Brand new in package. UPC: 7376100328607. Made in China. Great for learning about power supplies or as a reliable module in a bigger project. Saves you time etching your own board. A versatile tool for any tinkerer's workshop.