Relaxing in the pond Fish Repeller
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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Submersible Transducer