We found this circuit in a 1976 documentation. The FET can be BF245 or MPF102 and the power supply need not be symmetrical. The FET in the feedback acts as an automatic gain control.
Found in a 1980s documentation, this circuit makes use of components from that time. Modern...
This two transistor audio amplifier stage was found in a publication of the year 1968. The...
This receiver for medium wave range with germanium transistor was found in a documentation from...