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.
Found in a 1968 documentation, this small amplifier was very popular at the time being used in...
This sensor circuit was found in an American 1980s documentation. Modern operational amplifiers can...
This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old...