This commercial receiver from the year 1958 uses two AA cells as Power supply. The circuit is intend to receive MW station and the transistors are germanium types not easy to find today.
This simple audio signal tracer or follower can be made with a BC548 instead of the original...
The circuit shown in figure 1 is a suggested application for ISL8107, a new integrated circuit from...
This notch filter or reject filter rejects signals of a certain frequency with good selectivity. The...