We have 25 children building wind generators in teams. The output once complete is small (2v p-p, 0.7Vrms). As well as showing their waveform on a (laptop) oscilloscope we would like to make it "do something". We know this is not enough but how about: a simple electronic switch that brings in another (power) cct that lights LED's? OR/AND turns on the motorised cablecar (from last year) with it's own power source to travel across the room. What sort of cct + "bits" would be required?