Found in American documentation from the 90's, this circuit can be implemented with modern equivalent components. Observe the symmetrical power supply.
This portable transceiver circuit for the 11 meter or 27 MHz band was found in a 1991...
This circuit was found in an American 1980s documentation. It makes use of an unusual MOSFET today...
This circuit was found in an old Linear Technology documentation. The working principle can be...