ORIGINAL: PFozz

The “rim detection” part of your circuit 2 seems to work.
Try to connect the rim piezo “+” (ceramic part) to the tip of your stereo plug.

Best.

Do you mean I have to connect the two “+” of the piezos with a wire? or with a diode like circuit 1/3?

It seems you know how the circuit exactly works. I would appreciate if you could give a technical explanation about each part of the circuit, what do they do, etc. That information would be very very useful to me because then I could be able to change component values with the knowledge of what I’m changing, or to add or remove parts of the circuits to achieve what I need.

(Thanks for all of your replies)