Low power circuits have always been fascinating to me.
Here are some reference circuits:
- http://www.instructables.com/id/The-Easter-Solar-Engine/
- https://makezine.com/projects/joule-thief-battery-charger/
- https://en.wikipedia.org/wiki/Joule_thief
- https://rimstar.org/science_electronics_projects/joule_thief_power_cfl_with_jeannas_light_circuit.htm
- https://rimstar.org/sdenergy/joule_thief.htm
Would be great to build some of these projects- anyone interested?