This is a really tiny buck converter. You just got to see it to believe it!
The DC to DC converter can accept anything between 4.75V to 23V DC on its input terminals. There is a trimpot (adjustable resistor) which is used to adjust the output voltage by turning it with a small screwdriver. Since this is a step-down (buck) converter, the output voltage is always lower than the input.
There are four solder pads at the corners. Flip the board and you will see which one is the positive input, positive output and so on.
Features:
Small size DC to DC step down/buck converter with adjustable output voltage
Module Properties: Non-isolated step-down module
Rectification: Synchronous rectification
Input voltage: 4.75V-23V DC
Output voltage: 1.0V-17V DC (Adjustable, Output < Input)
