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.
This monostable circuit appeared in Radio Electronics magazine in October 1965. The circuit...
This is a simple variac type source found in the July 1962 Radio Electronics magazine. Voltage and...
April 2017 - The ADXL35x line of Analog Devices accelerometers can now be obtained from Mouser...