The output voltage of this circuit is approximately four times the supply voltage. The circuit is from an Electronics Now April 1995. The output current is very low.
The contact of the sensor with water or humidity causes the relay to close its contacts. The...
Powered by 12 or 13.6 V, this transmitter has an output power of the order of 1 W, which provides...
This circuit was found in an 80's documentation using an NE5514, operating at the time. The font...