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 is a bridge for the measurement of low value resistances and high values too. The circuit...
In the figure we have the way to obtain a voltage indicator for a 3-terminal voltage regulator. The...
This circuit was obtained in old documentation, but it is valid for modern triacs that must be...