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I've made several of these and they are called "fish callers". 9 volt battery operated, Put it in a sealed waterproof container like a pill bottle, add enough weight to cause it to sink, and with a string tied to it - drop it in and I can pull it back up. Works OK (didn't say great - just OK).
It is a pain to use because the container has to be opened to snap the battery in - then sealed back up.
What I want to do is add a transistor (PN2222A) and have it act as a switch. A base wire and a + wire protruding out of the pill bottle about 1/2" apart (waterproofed of course) and when the call is lowered into the water the conductivity of the water would make the circuit and fire the base with enough voltage. Then when it is removed from the water - it automatically shuts off.
I've done this same thing with the water before using the 2 wires as a water detector - works fine.
My question is just where exactly in the circuit to put the transistor - see the red circles in the schematic. A - B - or C?
Or interrupt the wire going to one or the other bases on the transistors that are already in place and not adding one.
Incidentally anyone is welcome to try this - it works best on drawing minnows into an area.
Thanks in advance for any and all comments.