The resistivity of salt water is ~2 ohm-cm, with fresh being 30 kΩ-cm.
Even with a wide tolerance on these values, if your line is 10' from your return conductor I think the current drain will be ~0, so I don't see the need for a regulator unless the fish are picking nits on that day.
Here's one P/L
9 V battery
8.2 k resistor
1 k pot
The pot wiper is the output.
Electric chairs deliver 4 to 8 amps at 2400 VAC, so you could add a switchable ~100 KW supply to the line in case you hook a shark. If you do this, post your video and include the word "jaws" and "revenge" in its title. . .
Perhaps that particular frequency and voltage is fishorgasmic ? What do we know
There is no current circulation in the loop. The loop is an electrode, just circular; they do not show the other electrode.
Thanks for this info. I have never done an electronics projects - but - I intend to find someone to help me do this project - you know help me with the board - acquiring parts - assembly Yeah, you can say I am a dreamer.
One way to fix the "typo" in the LM358 circuit would be to not install R2. You can install a jumper in place of R1. This will set the gain to 1 and the voltages available will be 0.34 to 1.17 when the battery is at 9.0 volts.
Another way would be to leave the gain as is and modify the voltage divider by changing R3 to 180 ohms.
Post how it works, not the circuit, the fishing part.