A simple but effective solution for a nasty problem. How to build this is available on instructables.com
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I don’t how missed this, with kids allergic to bites, this might come in handy.
Airpump, why doesn’t he just use a speaker with a low frequency directly coupled to the fluid.
Perhaps a transparent ball with a solar panel at the top and the speaker with electronics at the bottom (so that it floats upright) with the associated timers.
Does anyone have any ideas for improvements?
If I can find a ball I think I will try this one.