I need some help with a project I'm working on. I'm trying to test various Joule Thief circuits, namely what voltages they cut out at. I need some sort of power supply that I can adjust down to very low voltages. Something in the range of 0v-2v. Normally I would use a step down converter or a LM317, but they have minimum output voltages of 1v-2v (1.25 for the 317). I need something that can go lower. I've tried various circuits, both copied and of my own design, but I haven't been happy with any of them so far. One big problem I've been having is the voltage drop on the supply. For example, I'll set the supply to say 1.50v, but when I connect the Joule Thief, it'll go down to 1.20v. Some voltage drop is ok, but not that much. Anyone have any ideas? And no, I'm not going to buy a variable power supply, I don't have the money.
Thanks
~Jblack
Thanks
~Jblack