How to Make a Home Regulated Laboratory Source (In a Few Minutes) Lm317. In this video tutorial of easy electronic projects we are going to make a homemade laboratory source or regulated power supply. For this homemade tool we are going to use various recycled materials, we are going to use a recycled wooden box made from anything else, but any other material can be used. a recycled heat sink from any other electronic card, a lm317 voltage regulator, a 220 OHMS electrical resistor, a recycled power supply from another electronic device in this case it is recycled from an old laptop, a 3digit voltmeter, two crocodile or alligator clips to hold the electronic components, a 10k potentiometer, a switch that can be recycled from an electronic device or appliance, a 10 uf 50v electrolytic capacitor or capacitor, and a .1 uf ceramic capacitor, electrical cables connection that we can recycle from many electrical or electronic devices, we are going to use tin, soldering iron or soldering iron and some other tool, at the end of the video I leave you an electrical diagram so you can see how it can be done easily and be able to do it yourself without problem, it is an essential tool for the electronics workshop since it helps us to test many electronic components, tests in circuits, and many more things, if you like the video, do not forget to leave your like, thanks ..