https://www.futureelectronics.com/resources/videos/tt-electronics-opb9001 . The OPB9001 PCB module accepts supply voltages from 3.3V to 30V, and comes with built-in voltage protection for maximum flexibility and protection. An integrated industry standard 4-pin Molex connector provides ease of connection, while the onboard LED indicators show overall status during power-on, output and calibration. https://youtu.be/OcE-uaUoTsk