Solar container inductor chirp

In the final photos in the introduction you can see my first attempt to miniaturize this circuit by designing a PCB back in 2019 (this was one of my first PCB projects and it doesn't even work, the solar panel is too small!). The proposed on-chip power source compcells and the proposed energy harvesting system. Such findings highlight why inductors, though often overlooked, have become a central focus in engineering. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the U. This process is convenient for wiring and installation, no need to cut off the cable. The final circuit chirps on and off for about 20-40 seconds (watch the video to hear it chirping) and then stays off for another 1-2 minutes before chirping again. I originally just wanted to make this as small as possibly but in doing so I realised it could actually be made as a pendant and I am.