Hi I am looking for a solution to obtain constant current for an electrolytic process which requires a range of 5mA to 15mA and 4.5 Volt to 30 volt. I was thinking of a dc charger with adjustable voltage which will be attached LM317 as shown in the figure. I am planning to attach a variable resistor to adjust resistance. To measure the output dynamically a multimeter will be connected in paralled to the load. Will this work?