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.
This source was originally suggested by Delco in a 1969 documentation to power amplifiers up to 50 W. The...
This circuit was found in documentation from National Semiconductor. The formula next to the...
The integrated circuit used in this 90's circuit is not very common today. An equivalent...