DC Voltage Adjustable power regulator Step down power regulator can run any voltage from 4.5 volts DC to 35 volts DC. The unit will step down the input voltage to the required voltage provided the input voltage is at least 1.5 volts DC higher. It will run up to 2 amps output This unit is user adjustable to give the correct voltage to the item needing a regulated power source. It has a LED display fitted for ease of setting the voltage, It can be switched between the input voltage and the output display by pressing the switch shown on the diagram. There is also a indicating led to state what is being displayed. The voltage is adjusted be turning the screw on the blue potentiometer clockwise increases the output voltage and anticlockwise decreases the output voltage. There are screw terminals and solder pads for connection. vin is the positive for the input power and vin – is the negative input vout is the output positive and vout – is the output negative. If you wish to use this unit on the DCC supply (AC) then a Bridge rectifier need to fitted before the module