We found this circuit in the May 1989 Radio Electronics magazine. The circuit can have its values changed to operate at other frequencies and the power supply must be symmetrical.
This circuit uses a transistor as noise source and a 741 IC as amplifier, sourcing a high...
This simple circuit detects when a conductive liquid reaches the sensors. The circuit has no...
With this circuit it is possible to raise the characteristics of a transistor by checking its gain...