The FETs of this circuit can be the BF245. The circuit is from an old documentation and can be used in the amplification of infrasonic waves, of a sonic attack, for example.
This circuit was found in a Mallory documentation from 1968. The integrated circuit is of the...
In the figure a circuit that is the basic application of NE567 for the detection of a tone applied to...
This circuit applies a signal to the end of a built-in cable so that it can be followed with a...