not sure where to post this so I will start a thread. I found a sheet of mica and some nichrome wire in the lab where I teach and quickly stitched together a subitism style burner. I can power it with a 9V battery which is nice but I got an inexpensive lab power supply unit like kyarazen suggested and pieced together a simple burner using a glass Petri dish and a clamp. I love the way this instantly heats up and the temperature can be so precisely tuned with the power supply. Nice to be able to regulate the heating and adjust the temperature as the wood gradually blackens. What’s cool about these is the lack of any lag in temperature change. It is nearly instantaneous. I never burn as much as I would like because of the obvious issue with coals. If anyone has any clever ideas for rigging rhe thing up in an efficient / sturdy way, I’d love to know. Right now it works but is pretty delicate.