I’m very disappointed about your LM2596, I purchase one on your Amazon site that I received 3 days ago just to find out that it’s not working. I can’t adjust voltage or current so I figured it’s defective it appends so I returned it and ordered a new one that I just received and guess what, that one isn’t working either!!!!
I tried different power supply with no results. Your quality control is not really up to par, needless to say that I will not purchase from you again!