Each coconut is hollowed out and fitted with a circuit to detect electrical fields, as well as the battery to power it and a speaker and motor to react to changing intensities. Coconut = $1.99 Tiny Perf Board = $0.75 (2) 10 kohm Resistors = $0.02 (2) 4.7 kohm Resistors = $0.02 100kohm-1Mohm Resistor = $0.01 (2) PNP Transistors = $0.20 (2) NPN Transistors = $0.20 100pf Capacitor = $0.25 Power Switch = $0.25 Speaker = $1.50 Lithium Battery = $1.25 Battery Clip = $0.50 Motor = $0.99 ------------------------------ SUB-TOTAL = $7.93 tax (8.5%) = $0.67 ------------------------------ TOTAL = $8.60
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