This simple rain, leak or moisture detector circuit appears in other places on this site with slight variations. This was obtained in an English documentation from the 70s.
November 2016 - Maxim's MAX30003, an Analog Front End (AFE) for biopotentials with clinical grade...
This receiver was found in the Radio Electronics magazine of March 1953. It tunes to the medium wave...
Audio signals can be produced by this circuit. Frequency range is determined by C1 and adjusted by...