Building a Test Load (4-30V 0-4A)

Let's build a DIY test load to test USB chargers and other power supplies. It can operate at 4 to 30V supply voltage and draw an adjustable current from 0 to 4A. Warning: it can get very hot, risk of fire or burns! The FNB58 USB tester I'm using: https://www.fnirsi.com/products/fnb58... My test load on my website https://danyk.cz/zatez2_en.html Please support my channel on Patreon:   / diodegonewild   Instagram:   / savage_danyk