I saw this picture of the internal heating elements of the mighty. I hadn’t seen it before so I wanted to share!
Pretty neat: you can see the thermocouple in the bottom left of the heating chamber to track temp, the air path spirals up the element picking up convective heat, and you can see the hottest spot is in contact with the herb bowl which gives it the conductive heating. Superbly designed device!
IIRC it can be done with a bunch of 9v batteries connected together