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.
The circuit shown in the figure can be used to connect a loudspeaker to an amplifier only after...
The circuits shown below consist of diode protections against accidental polarity reversal in the supply...
This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be...