This circuit was found in an Australian publication from 1991. It is a transmitter that transmits a signal when it detects moisture. The range is on the order of a few tens of meters.
This circuit was found in the December 1977 issue of Radio Electronics magazine. The circuit uses...
We obtained this circuit from an old Argentine magazine. The circuit originally uses germanium...
The 78XX series voltage regulator integrated circuits do not support an input voltage greater than...