This reflex receiver for the mid-wave range employs germanium transistors of the time. We found it in an English documentation from 1967.
We find this circuit in a 1973 technical documentation. Common transistors may be BC548 and FET or...
This simple circuit uses a 200 µA galvanometer to measure voltages in three ranges. The circuit...
This circuit is a from publication 1980, but still can be mounted with BC548 transistors for Q1...