Quantity   Component name
1 × Base of aluminium soft drinks can
1 × Activated charcoal disc from water filter
1 × Tissue paper disc
1 × Saturated salt water solution
1 × Coin
1 × Short length of bare copper wire
1 × Ferrite core transformer
1 × 1K ohm resistor
1 × General purpose NPN transistor
1 × LED Fiber Optics / Emitters
1 × Spring clip