LM317 Adjustable Voltage Regulator Board Digital Display Power Supply Module DC 3 30V AC 3 20V

Specification: Input voltage: DC 3-30V / AC 3-20V Output voltage: DC 1.25V-28V Output current: Max. 2A Board size: 72*39*28mm / 2.83*1.53*1.1in Mounting size: 65*32mm / 2.56*1.26in Mounting hole: 3mm Weight: Approx. 43g / 1.5oz Package list: 1 * Adjustable Voltage Regulator Note: 1. Because the working voltage of digital tubes is 4.5V, it displays normally only when the voltage is higher than 4.5V. 2. When inputting 5V, it can output 1.25-2V and won't output a higher voltage.