This circuit was found in an old manual of integrated circuits. The operational is of the time, uncommon nowadays. The power supply must be symmetrical.
This simple rain, leak or moisture detector circuit appears in other places on this site with...
This circuit was obtained in a 90s EDN. The components used are from that time. The voltage...
This circuit is from a 1967 General Electric SCR manual. The capacitors are polyester and the...