Solar panels (flexible solar panels)

Transformers

Wind power

Light dimmers

Solenoids

Air fresheners

Balancing circuit

Battery-less flashlight- Design your own!

Electric Shocker / Zapper – Snapshot Stunner

Guitar Tuner

Battery chargers or rechargeable batteries (supper capacitors)

Alternative energy projects: why? Ezine articles

Existing types and their differences

Internal architecture and diagrams

Pricing, range of operation

Pictures of different designs

Applications examples

Description of basic operation; include some formulas if possible

Experimental data