Fish callers

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We want to go fishing to figure out if some heavy metal pollution is present in the food chain (fishes), so we are trying this device to make our data gathering more successful. Some fishes might be attracted by the sound of smaller fishes eating. The challenge is to find this frequency.

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Our own fish caller circuit on github.



Documentation of fish caller workshops


A fish caller circuit kit [1]
!985 Electronic Circuit Diagram > Alarm > Beeper Sound [2] Advertisement for fish caller bait [3]
A video of the above fish caller kit [4]
A startup (?) making fish callers ? [5]
Angler's bite booster circuit:
A patent for a fish caller [6]
Finally, this one looks doable, with schematics and all components values [7] 555 Astable Circuit Calculator [8]