We found this good power amplifier with the LM12 integrated circuit in the March 1989 issue of Radio Electronics magazine. The output power is around 100 W.
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...