This circuit was found in an American 1980s documentation. The transistorized step is the receiver's last IF and the diode is the receiver's existing detector.
This circuit was found in a documentation by A. Fanzeres making use of a grounded metal housing...
This circuit, found in American documentation, works as a voltage doubler, enabling the supply of a...
This circuit was found in documentation from the 60's. The low current transistor is from the...