Few things are more relaxing than floating in the pond with the late afternoon sun beating down on your shoulders, burgers cooking slowly on the grill, and a cloud of voracious sunfish constantly nipping at your toes. To help me focus my attention on the sun and the burgers, a fish repeller was in order. I tried building an underwater transducer driven by a tuneable oscillator...tuneable to what? That was a problem: sunfish didn't seem to mind the noise. But now that I have found an effective way to keep my dog out of the water, I can focus on building a floating grill.
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