24v to 12v Step Down Converter, DROK LM2596 Analog Control Buck Transformer DC-DC Voltage Reducer Regulator Module 36V 24V 12V to 5V 2A Power Inverter Volt Stabilizer with Red LED Display Voltmeter

today we're going to learn a few things about this nifty little device that's being sold on eBay it's called a buck step-down power converter module and its really a multi-purpose here in it and the first thing we're going to learn how to do with it is use it as a voltmeter now on the left hand side of the module there's a terminal block where you connect a DC power supply or the power supply that you want to measure the terminal block is labeled with positive and negative symbols so I've connected a red wire to the positive screw terminal and a black wire to the negative screw terminal we're going to zoom out and you can see that I've run the wires over to my 12 volt power supply and this is what we're going to measure the voltage of now like most 12 volt power supplies this one actually puts out about thirteen point eight or thirteen point nine volts and that's a legacy of the automob