I'm interested in Big dummy load. Has circuit to look at some pls.I built one here (called Big Dummy);
The two heatsinks came from a junkyard piece of equpment and were already populated with the big transistors, already wired as darlingtons. That was common in high power linear power supplies, 1960's 70's 80's etc.
It uses a pot to set the current. The biasing is set up at the moment to work with about 5v-48v and 0A to 30A.