From an audio signal, this circuit gets two signals of the same amplitude and opposite phases. This setting is widely used in bridge amplifiers (BTL). Transistors may be commonly used as BC series.
This simple circuit was found in Popular Electronics. It can be built with any JFET. Galvanometers from...
This circuit, with printed circuit board included, is from a Radio Electronics magazine from July...
This circuit for FET was obtained from a 1977 Radio Handbook. The input impedance is 150 ohm. The...