This circuit was found in a 1985 documentation. It provides an audiovisual indication of the presence of moisture or water in the sensor. The circuit can be powered by voltages from 6 to 9 V.
Found in an August 1969 Radio Electronics issue, this circuit steps down a high DC voltage to 5 V...
June 2016 - Mouser can immediately deliver the TPS54xx plate for experiments with Buck converters from...
This circuit was found in the December 1971 issue of Radio Electronics magazine. The circuit is...