LM2577S + LM2596S dual chip modules,
DC-DC step up step down module with wide voltage design,
suitable for solar panel and other high fluctuation external input power supply
Appearance size (L x W x H): Approx. 5.4 x 4.5 x 1.4cm
Step-up mode: Input 3.5-28V, output: 1.25-26V
Output voltage is irrelevant to input voltage (input 3.5-28V with arbitrary value, output 1.25-26V with arbitrary value)
Step-down mode: Input / Output current (max.): 3A, rated input/output: 1A (Please add cooling fin when working in big current)
Voltage regulating mode: (Step-up) Potentiometer rotates in clockwise, (Step-down) Potentiometer rotates in anticlockwise
Note: Because of lower switching frequency and input high current, it is normal to use if it has some noise